Making a standard solution Essay Example

Making a standard solution Paper To find the molarity of the unknown acid, first we had to create a standard solution, the solution we created was Sodium Hydroxide (NaOH). We wanted a 0. 1 molar solution of sodium hydroxide so to get this we had to dissolve 4g of NaOH into 1000cm? of water, but we didn’t want 1000cm? we wanted 250cm? so to work out how much sodium hydroxide would be needed you need to do the same equation to the number of grams (g) than with the volume of water, so to get 1000cm? down to 250cm? You divide it by 4, so you divide 4 by 4 which gives you 1, so one gram of NaOH is needed to make a 0. 1 molar solution in 250cm? of water. Next is making the solution, the equipment needed to make this standard solution is: a balance, beaker, volumetric flask, glass rod, wash bottle. And the ingredients for the solution are NaOH and distilled water. To make NaOH solution is to measure out 1g of sodium hydroxide and place on a scrap piece of paper which is on the balance, it isn’t essential that you get exactly 1g just approximately 1g. Then put some distilled water into a beaker enough to dissolve the sodium hydroxide, transfer the sodium hydroxide from the paper to the beaker and dissolve by swirling and stirring. Once dissolved transfer this solution to a volumetric flask, and wash out the beaker and glass rod which was used to stir the solid NaOH into the water, now add distilled water to the volumetric flask, up until the bottom of the meniscus is on the 250cm?line and shake and mix it up a little, then you have made your solution. In my solution it wasn’t 1g, I weighed 0. 99g. The next stage is to calculate the molarity of your solution. We will write a custom essay sample on Making a standard solution specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Making a standard solution specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Making a standard solution specifically for you FOR ONLY $16.38 $13.9/page Hire Writer To work out the moles it is moles= grams ? relative molecular mass (RMM) so for my solution it will be 0. 99? 40 (40 is the RMM of sodium hydroxide, this is calculated by adding the mass of each atom in the compound together, so for NaOH it is Na=23 O=16 and H=1. 23+16+1=40 this is where the 40 comes from.) 0. 99 ? 40= 0. 02475 rounded to 4 decimal places is 0. 0248 that is the molarity of the 250cm? but molarity is always measured in 1000cm? so now you have to times 0. 0248 by 4, 0. 0248 x 4= 0. 992, and that is the final molarity of your solution so my molarity is 0. 992M. Now is to titrate you solution with the unknown acid, to do this you need: a clamp, a beaker for acid, a beaker for your standard solution and another beaker for waste, a conical flask, 50ml burette, 25ml pipette. Once all the equipment has been set up you now need to add your unknown solution into the burette and leave the tap open and put the waste beaker under it to make sure there is no air bubbles in the burette, turn the tap off and fill the burette up, now take the pipette filler and fill up your pipette with your standard solution and put that in the conical flask, add a colour indicator to the conical flask and put the conical flask under the burette open the tap, and you are looking for the first colour change that lasts for approximately 10 seconds, repeat the titration until you have 3 results within . 1 of each other. In my titrations I did 4, the first result was 22. 6ml used, the second was 23. 1ml, third was 22. 7ml and the final one was 22. 8ml. Now the calculation for the molarity of the acid can be solved. The first step in working out the concentration of the unknown acid is balancing the equation. The equation for our experiment is: NaOH + HCl i NaCl + H2O and this equation is already balanced because there is 1 atom of Na on each side, 1 atom of O on each side, 2 atoms of H on either side and 1 atom of Cl on each side. So this reaction is a 1:1 reaction. The reasons this is a 1:1 reaction can be found in the periodic table, the RMM of each side of the equation has to be the same and to work this out you need the atomic mass, Na=23, O=16, H=1 (x2) and Cl=35. The atomic mass is the larger of the two numbers on the periodic table found with an element. The total of these atomic masses is 76. And it is exactly the same on the other side it is just that the compounds are different, this is due to the groups on the periodic table that they are in and that determines the bonds between atoms. The equation to work out the concentration of the unknown acid is: moles x 1000 ? average titration. The average titration is all the titration results added together and divided by 4, but we are going to discard the 23. 1ml result because it isn’t close enough to the other three so is recognised as an anomaly, so (22. 6 + 22. 7 +22. 8)? 3 = 22. 7cm? so now using the equation you can work out the concentration of the acid. (0. 0248 x 1000)? 22. 7 = 0. 1093, the actual concentration of the acid was 0. 0984. My predicted concentration is 0. 0109 above the actual concentration this could be due to inaccuracies with the measuring of the mass of NaOH to begin with also wrongly measuring the amount of my standard solution was used to titrate the acid.

How To Streak a Bacterial Culture

How To Streak a Bacterial Culture Bacterial culture streaking allows bacteria to reproduce on a culture medium in a controlled environment. The process involves spreading bacteria across an agar plate and allowing them to incubate at a certain temperature for a period of time. Bacterial streaking can be used to identify and isolate pure bacterial colonies from a mixed population. Microbiologists use bacterial and other microbial culture streaking methods to identify microorganisms and to diagnose infection. What You Need: Culture plate with microorganismsInoculating loop or sterile toothpicksAgar platesBunsen burner or another flame producing instrumentGlovesTape Heres How: While wearing gloves, sterilize an inoculating loop by placing it at an angle over a flame. The loop should turn orange before you remove it from the flame. A sterile toothpick may be substituted for the inoculating loop. Do not place toothpicks over a flame.Remove the lid from a culture plate containing the desired microorganism.Cool the inoculating loop by stabbing it into the agar in a spot that does not contain a bacterial colony.Pick a colony and scrape off a little of the bacteria using the loop. Be sure to close the lid.Using a new agar plate, lift the lid just enough to insert the loop.Streak the loop containing the bacteria at the top end of the agar plate moving in a zig-zag horizontal pattern until 1/3 of the plate is covered.Sterilize the loop again in the flame and cool it at the edge of the agar away from the bacteria in the plate that you just streaked.Rotate the plate about 60 degrees and spread the bacteria from the end of the first streak into a second area using th e same motion in step 6. Sterilize the loop again using the procedure in step 7.Rotate the plate about 60 degrees and spread the bacteria from the end of the second streak into a new area in the same pattern.Sterilize the loop again.Replace the lid and secure with tape. Invert the plate and incubate overnight at 37 degrees Celsius (98.6 degrees Fahrenheit).You should see bacterial cells growing along the streaks and in isolated areas. Tips: When sterilizing the inoculating loop, make sure that the entire loop turns orange before using on the agar plates.When streaking the agar with the loop, be sure to keep the loop horizontal and only streak the surface of the agar.If using sterile toothpicks, use a new toothpick when performing each new streak. Throw all used toothpicks away. Safety: When growing bacterial colonies, you will be dealing with millions of bacteria. It is important that you follow all lab safety rules. Precautions should be taken to ensure that you dont inhale, ingest, or allow these germs to touch your skin. Bacterial plates should be kept closed and secured with tape while incubating. Any unwanted bacterial plates should be disposed of properly by placing them in an autoclave to kill the bacteria before discarding them. Household bleach may also be poured over the bacterial colonies to destroy them.

Custom Essay A No-Cost Sample About Pandas Created by Top Writers

Custom Essay A No-Cost Sample About Pandas Created by Top Writers Descriptive Essay Example about Pandas How could anyone not be charmed by a Giant Panda? The black-and-white bears are a national treasure of China, whose bamboo forests are their natural habitat, and universally recognized as the epitome of cute: A panda is nothing more or less than a chubby, fluffy ball of gentleness, and if we didn’t know they were a real animal from an identifiable part of the world, we would assume they came from the same place where rainbows and unicorns are made. In ancient China, warring armies even used to raise flags emblazoned with images of pandas when they wanted to stop fighting and discuss their problems peacefully. Private Writing offers professional writing assistance with any kind of writing assignments in any field of knowledge alongside with the individual approach to every customer. Our top-notch customer support is ready to help you 24/7. Place an order and enjoy the result. It seems, however, that Mother Nature may have given the Giant Panda its heartwarming appearance as a consolation prize to partly make up for all the other traits that make the panda kind of an evolutionary failure. The Giant Panda is indeed a peaceful creature, but that is because it simply does not have the energy not to be. Unlike other bears, which are omnivorous, the panda’s diet consists solely of bamboo. A single panda requires an area of about four square kilometers of bamboo to have a sufficient supply of food, and it must spend 14 to 16 hours of each day eating that food in order to survive. The panda has to spend so much of its time eating because it has a poor digestive system. The panda only uses about 30% of the nutrients from its diet; by comparison, other herbivores such as deer use about 80%. The panda’s diet does give it one dubious talent: Pooping. Because most of what it eats passes through the panda’s system undigested, an adult panda produces an astonishing amount of â€Å"number two† – as much as 62 kilograms per day. The Giant Panda’s inability to use its food efficiently also prevents it from hibernating; the panda simply cannot eat enough to build up the fat reserves necessary to allow it to slumber through the winter like a â€Å"normal† bear. The diet also is responsible, some scientists believe, for the panda’s unusual reproductive pattern. Female pandas ovulate just one a year and are only fertile for two or three days. Because pandas must individually maintain a large area of the bamboo forest for their own food needs, encounters between pandas in the wild are relatively rare, and that includes opportunities for mating. If mating is successful, gestation takes from four to eight months; the wide time range is due to the female panda’s body delaying implantation of the fertilized egg until there is enough nutrition to support it. Then once the panda cub is born, it has a fifty-fifty chance of surviving to adulthood; panda cubs are easy prey for a number of predators, but more often than not are killed by being accidentally crushed by their own mothers. While the Giant Panda has been seriously threatened by human activity such as poaching – which is treated as a heinous crime in China, punishable by a long prison sentence or even the death penalty – and destruction of its natural habitat, the panda’s characteristics that naturally seem to work against its survival have led some scientists to conclude it is a â€Å"remnant species†: One that is naturally becoming extinct on its own. In that sense, the fact that pandas are just so darned adorable may be a clever evolutionary advantage – unable to survive in the wild, the Giant Panda is equipped with a look and a personality that has proved irresistible to the one species with the ability to overcome nature for the panda’s ultimate benefit. We hope that this descriptive essay sample provided above will help you to write a brilliant descriptive essay. If you dont have time to write a descriptive essay on your own, feel free to contact our essay writers or place an order.

Personal profile about Roger Tsien who is biochemist Essay

Personal profile about Roger Tsien who is biochemist - Essay Example However, such technology was available from the as late as the 1990’s. Roger Tsien was the winner of a third of the Nobel Prize in chemistry in 2008, along with Osamu Shimomura and Martin Chalfie. The winners of the 2008 Nobel Prize in chemistry were selected because of their research that led to the discovery and development of the green fluorescent protein, GFP. Their work on GFP was important in the field of biology as it enabled scientists to be able to study living cells at the molecular level. Roger Tsien is a Chinese-American born on February1, 1952 in New York, USA. The professor of the University of California, San Diego Tsien is a generational descendant of ancient china Wuyue kingdom’s King Qian Liu. In addition to his rich genealogy, Tsien comes from an intellectually accomplishment family. His father was a graduate from Massachusetts institute of technology (MIT). Additionally, the brothers of his mothers were engineering professors of Massachusetts institute of technology (MIT). The cousin of his father, Tsien Hsue-Shen is a highly regarded rocket scientist. Additionally, his brother is a scientist at the New York University. Tsien early years were lived in Livingston (NJ). As a child, Tsien mainly stayed indoors due to his asthma condition. This provided the Livingston high school student at the time, to focus his energies towards chemistry experiments. After pouring most of his free time towards experiments at his basement laboratory, he was able to win the Westinghouse talent search. His winning entry in the national prize completion was an investigation of how metals bind to thiocyanate (Tsien, 2014). On graduation from Livingston high school, he proceeded to Harvard University. In 1972, he emerged from the university with a bachelor of science in chemistry and physics. Having studied In Harvard University on a national merit scholarship, Tsien got a

Research company tries to show that you can only understand consumer Essay

Research company tries to show that you can only understand consumer behaviour by living with their behaviour - Essay Example For this reason, a high range of research methods has been developed for helping marketers in developing the above task. In practice, it has been proved that certain of these methods are not fully effective, allowing the appearance of inaccuracies in their findings. The potential use of ethnography as a research method is explored in this paper. The ‘Project Keyhole’, a research program based on ethnography is used as an example. The project was developed by the advertising firm BMP DDB. The advantages and the limitations of ethnography are also critically examined in order to understand the reasons that led BMP DDB to choose the specific research approach. It is proved that ethnography is a quite effective research method, under the terms that the rules related to its application are respected. 2. Ethnography as a research approach for studying consumer behaviour 2.1 Importance and limitations of ethnography as a research approach Ethnography is a quite popular qualitat ive research method (Rubin and Babbie 2009, p.218). The key characteristic of ethnography is ‘observation in natural settings’ (Rubin and Babbie 2009, p.218). More specifically, in the context of ethnography researchers can observe the behaviour of a social group in regard to a particular social activity (Rubin and Babbie 2009, p.218). ... The research tools used in the context of ethnography are interviews and observation (Rubin and Babbie 2009, p.218). Haviland et al. (2010) also note that ethnography is preferred from other qualitative research approaches since it can offer valuable information on a particular culture, as the similar assumptions have been developed through fieldwork (Haviland et al. 2010, p.12). As a research method, ethnography has certain requirements. The common culture of the social group under observation is the primary condition for the development of a successful research project using ethnography (Rubin and Babbie 2009, p.218). Then, it is preferred that the social group participated in the research project is isolated (Haviland et al. 2010, p.12). Isolation, as a term related to ethnography, reflects not just the lack of participation in certain social activities but also the gathering in a particular area, where the social group involved can develop its own style of life (Haviland et al. 2 010, p.12). Reference can be made, as examples, to the ‘Islands of the Pacific Ocean or the deserts of Australia’ (Haviland et al. 2010, p.12). The above fact cannot lead to the assumption that ethnography cannot be used in the industrialized countries. In fact, ethnography can be used in every place where a social group, of any size but of a common culture, is established (Haviland et al. 2010, p.12). A household can be a social group that could be studied using ethnography (Haviland et al. 2010, p.12). From a similar point of view, Schensul and LeCompte (1999) note that the key requirement for the development of a successful research project based on ethnography is the ability of the researcher involved to identify ‘the cultural

Environmental impact of tourism in Romania

Environmental impact of tourism in Romania The Environmental Impact of Tourism in Romania Introduction In this essay the main attention will be focussed on the impact of tourism upon the environment in Romania, so the positive and the negative aspects of tourism will be brought in discussion. In Romania the environment is a factor influencing tourism demand. Given that the demand for products of interest is partly determined by its quality, the environment can have a positive or negative impact on tourism. Tourism-environment relationship is particularly important, protection and conservation of the environment being the primary condition for progress and development of tourism. This link is complex; it is manifested in both directions. The environment is defined as the quality of life of people living and natural environments suitable habitats for animals and plants. The impact of tourism on the environment The positive impact Tourism is one of the most important industries and has developed continuously. Romania is visited by more people which are interested in exploring new destinations and cultures as distant. Thus, areas having special natural resources attract more visitors, especially if they offer the opportunity to know the customs and traditions of other cultures. When tourism and environment coexist in harmony, environment benefits from tourism. There are many examples of this kind, most falling into one of two types: conservation and environmental rehabilitation. Preservation means keeping informed choice and use of the natural and anthropogenic. Conservation and tourism often go hand in hand. In Romania many historical and archaeological monuments have been saved from destruction because of tourist interest to them. In Romania parks and nature reserves managed to protect many species that would otherwise have been destroyed by uncontrolled hunting. Tourism not only provides a reason to preserve the environment from man, but also provides money for conservation: a share of the income from tourism can be used to preserve the environment. In this tourist from all over the world are involved in different touristic programs like hiking the trails of medium and high difficulty , visiting historical monuments and palaeontology, easy routes to points of Belvedere, and Keys resort to Rà ¢usor Buti, trails for ski touring, climbing routes, programs for the study / observation of flora, bird watching and observation traces animals. Conservation implies preservation of the environment in a form as close to the original, rehabilitation involves a major change in the use environment. Many buildings and tourist areas have been saved by being restored as tourist attractions or tourist accommodation.  Ã‚   Many buildings and tourist areas have been saved by being restored as tourist attractions or tourist accommodation. Many factories in Romania began a new life as museums, industrial areas were converted into places of festivals, a variety of impressive castles and houses that were in decay became accommodation for tourists. Such examples show how the environment can benefit from tourism, saving what would otherwise be lost entirely. The most important natural reserve from Romania, natural monument, internationally recognized as a Biosphere Reserve is Retezat National Park. The park contains many touristic attractions such as over 80 lakes, 20 peaks over 2000m, the most extensive and deepest glacial lake in Romania, more than 54 habitats of rare or vulnerable plants and animals, glacial relief in the north and caustic terrain in the south. In this reservation tourist from all over the world are involved in different touristic programs like hiking the trails of medium and high difficulty , visiting historical and paleontological monuments, light trails to points of Belvedere, ski at Rà ¢usor and Cheile Butii, climbing routes, programs for the study and observation of flora, bird watching and observation animal trails. Another international known touristic attraction from Romania is the Danube delta. Tourists from all over the world choose the Danube delta as their holyday destination because of its unique landscapes and habitats. This has a good impact upon the natural reservation, because foreign tourists help raising the money for modernising and maintaining the many and diverse natural habitats in the delta. The negative impact Tourism is a consumer of space and tourist resources, participating default degradation and environmental pollution and tourism potential. This degradation is carried out either by direct pressure of tourists on the landscape, flora and fauna and other tourist attractions on which tourism can partially or totally damaged or recovery by the misconception of some areas, points and tourist attractions. Human pressure on the natural environment increases day by day, people moving more often and longer distances on the past. Leisure offers greater opportunity in the exploitation and conquest of the natural environment, most free time is spent outside the city, in nature. Periodic output of the city to green areas in the form of tours, a weekend or holiday sites has become a social custom with negative environmental effects. Many of the environmental damage caused by tourism are caused by the large number of visitors arriving at destinations whose optimal reception capacity has been exce eded.   Ã‚   Environment rarely escape harm when the number of tourists is very high. Air and water quality and diversity of flora and fauna are inevitably affected in some way, and landscapes, cities and monuments. Movement of uncontrolled tourist sightseeing done in natural or anthropogenic causes of often irreversible destruction of some of the items they have devoted to tourist attractions (the destruction of vegetation and flora, breaking trees and especially juveniles, poaching, degradation of the landscape). Pollution is increasing and because of the nature of automobile tourism whose deleterious effect is alteration of air quality, destruction of grasslands, trees and flora, etc Another way of environmental degradation is the purpose of investment unscientific and irrational nature tourism, investments take the form of: over-dimensioning stations in terms of reception and treatment capacity, failure of general principles of natural resource exploitation. An example showing the mutual relationship between tourism and environmental complex in general, and the negative impact that it manifests on each other, in particular, is the disappearance of the last 20 years to 14 huts in the Romanian Carpathians, the loss due to fire. Such damage is due to negligence of tourists. Conclusions Through this essay it has been showen that tourism has much more negative impacts on the environment of Romania than positive ones and that they are often closely related to the economical aspect of tourism. In conclusion Romania is a country enjoying a natural setting with great potential and infrastructure often enough natural tourism, travel form, in this view, is less demanding . After research, results that Romania does not benefit by much more positive aspects, since many components of the environment have been destroyed by tourists, rather than preserved. As Romania has much to do about environmental preservation. References: Cooper et al, C., (1998) Tourism Principles and Practice, 2nd Edition. New York: Addison Wesley Longman Publishing Cooper et al, C., (2005) Tourism Principles and Practice, 3rd Edition. Harlow (Essex): Pearson Education Limited http://www.plural-magazine.com/article-the-danube-delta-eco-tourism-museum-center-in-tulcea.html http://www.romanianmonasteries.org/romania/retezat-national-park

“Catch Me If You Can” Analysis Essay

Catch Me If You Can directed by Steven Spielberg tells the story of Frank Abagnale Jr., considered one of the most successful con men of all time. I saw this movie recently after renting it from the video store, I found it so good that I had to buy it. Frank Abagnale Jr. is an astounding and interesting character. The real life Abagnale originally said that he did not believe Dicaprio to be ‘suave’ enough to play the role, but he certainly does pull it off. Dicaprio’s acting is superb, and totally believable as a man who could lie to, deceive, and con everyone he met without once losing any of his charisma or charm. Hanks is also excellent, he plays the role of the obsessed FBI agent well, and also with a likable quality. The interaction between these two characters was great, it was interesting to see a budding relationship slowly build between two characters who were actually positioned against one another. The movie takes place in the late fifties and early sixties over the course of five years of Franck Abagnale Jr. Frank Abagnale lived in a time of innocence and trust. You cannot help but identify with this lonely, troubled and brilliant child who through charm and inventiveness managed to dupe Pan American Airlines out of over two million dollars over the course of five year, all before the age of twenty-one. The brilliance and daring of his crimes inspires a visceral sense of admiration for this character. Who would not want to live the jet set life of a playboy constantly outwitting the authorities at every turn?The foil for this rogue is one Carl Hanratty, played by Tom Hanks in this film. The juxtaposition of these different men brings to mind the fable of the tortoise and the hare. Abagnale represents the hare with his brilliant flight of a life; while, Hanratty embodies the tortoise with his slow trudging but ultimately victorious pursuit of the hare. Character and moral aside a film’s setting and tone are what make it, especially in this case. The setting and tone change rapidly playing with the watchers emotions. Visual clues provide the clues for emotional shifts. Clashes of browns and brights in the school uniforms and teenage styles of the day force a geeky sympathy with the young Abagnale, and the blues and grays of the scenes depicting his home life slow the pace and lend a more serious note to the  dialogue. In the portion of the film devoted to Frank’s exploits across the globe colors are used to show the vast differences between the two main characters’ lives. Scenes involving Carl Hanratty are done in blacks, grays, and whites to encourage thoughts of loneliness. Abagnale’s scenes, however, are done in bright neon, blues, and whites. These scenes are meant to be fun and light with an innocent quality that reminds us of our own childhood, and also tricks us into believing that stealing millions of dollars is somehow okay and justifiable. As Much as tone and color affect the character of the movie, nothing plays a bigger role than the setting. The late 1950s and early 1960s are portrayed in this film as a time of innocence, where a simple switch in wardrobe changed the man. The era of three piece suits and hats was one marked by sharp class divisions. Both children and adults wore various uniforms throughout their daily lives. Appearance was everything in the late fifties, or so Spielberg would have us believe. Simply by picking up a briefcase and putting on a dark hat Abagnale went from playboy to businessman. This is not unlike today where each subculture has their own particular uniform, though I believe we are more discerning than our grandparents that could just be wishful thinking on my part. Each subculture has its own uniform whether they are punks, hippies, or preppies and generally follow it, our need to blend in with the herd fulfilled. A haircut and a shave make a grungy hippie into an upstanding member of society in the eyes of all. We have a need to label and place all things in neat categories. Abagnale used this need to his advantage and exploited it with the style of a teenager. The innocence of the times also played an important role. People wanted to trust Frank Abagnale and to believe there was nothing hiding behind his smile. A piece of paper and a ready wit were all Abagnale needed to become a doctor and assistant district attorney of Louisiana. It is appealing to think that when one tired of a career they simply moved on to another and learned on the job, especially careers as glamorous as those shown in Catch Me If You Can. Hanratty, once again, plays the foil and proves this particular point. A man who works tirelessly and does nothing but good is treated with disdain by everyone he comes in contact with. He lives a  solitary existence, admittedly self-imposed, takes little joy in life, and tirelessly pursues Abagnale for years. He lives in sordid place while the criminal lives the high life. What does this say about our society as a whole? Do we glorify the rogue who breaks all our laws but does it with such style? Do we degrade those that maintain our laws? We do.   We like those who break the laws and live unusual life. This is demonstrated by one particular line delivered by Abagnale Sr., played by Christopher Walken, â€Å"Where are you going tonight Frank? Some place exotic? Tahiti? Paris? You’re winning Frank and don’t you ever stop.†Catch Me If You Can was a major hit when released and it is easy to see why. Steven Spielberg has taken an interesting story and added his own personal touch to create a movie which is engrossing, yet incredibly easy viewing. The movie also has a cast to die for, which is another reason why it succeeds in every possible way. I will also admit that the ending is very nice and quite unexpected, the kind that actually brings a wide smile to the audience’s face. I think the real Frank Abagnale, Jr. is pleased with this film. It proves that even the most sneaky crook could be real likable.