Dehydration of Alcohols Essay Example for Free

Dehydration of Alcohols Essay Abstract The dehydration of cyclohexanol to cyclohexene can be done through fractional distillation. Once the fraction has been collected it must then be dried. The dried distillate is finally tested to determine whether or not it has been dehydrated. The three tests used were infrared spectroscopy, Bromine chemical test and Bayer’s chemical test. The infrared spectroscopy showed a large narrow peak at 3062. 12(cm-1) and 3020. 71(cm-1) which indicates that there is a double bond present. To assure the results were correct the chemical tests were done. The Bromine test was found to be positive for cyclohexene. The OH group was removed from the cyclohexanol and replaced with a double bond found around 3062. 12(cm-1) and 3020. 71(cm-1) and the dehydration was successful. Introduction Fractional distillation can be used when trying to dehydrate alcohols. Dehydrating an alcohol consists of taking away an OH group. Fractional distillation separates the initial compound into separate compounds; depending on what their boiling point is. Cyclohexanol can be dehydrated to form cyclohexene. Infrared spectroscopy is used to analyze a compound and can give a breakdown of what chemicals the original mixture is composed of. An example of this is the long broad peak around 3200 (cm-1) which signifies an OH group in the compound. This technique is very useful to help determine what a compound is made of and it can also be used with NMR to give a chemical structure. Since infrared spectroscopy can be used to analyze a compound it can also be used to verify that you have the correct compound. Another way to do this is to use a chemical test. There are multiple chemical tests that can be used, one of them being the bromine test. A bromine test is used to verify whether an OH group is present or not. Another test is used with KMNO4 to test whether and alkene is present or not. Using both chemical tests and infrared spectroscopy to analyze the substance it will be clear if fractional distillation and the drying agent were able to work together in the process of dehydrating the alcohol. Materials and Methods For this experiment, 5. 0-mL of cyclohexanol were weighed and placed in a 25-mL recovery flask. A magnetic stir bar was added to the flask. 2. 5-mL of 9 M sulfuric acid was added to the same flask and mixture was swirled. The fractional distillation apparatus was set up with steel wool in the column. A 10-mL receiving flask was placed in an ice-water bath. Fractional distillation was started making sure to maintain the head temperature between 80 and 85Â °C, making sure it did not go over 90Â °C. Heating was stopped once the mixture turned dark brown and a deep green condensate formed. Distillate was then collected and transferred to a 25-mL Erlenmeyer flask. Anhydrous potassium carbonate was added with a spatula to the 25-mL Erlenmeyer flask. Flask was swirled occasionally for about 15 min while adding more anhydrous potassium carbonate until liquid no longer looked cloudy. The mixture left that was not distilled was neutralized by adding bicarbonate to the solution, slowly, until foam stops forming. Dried liquid was then transferred with a Pasteur pipet into a 10-mL recovery flask containing a stir bar for simple distillation. Another 10-mL recovery flask was used as the receiver and a calcium chloride drying tube was connected with a vacuum adaptor. The more pure compound was collected by maintaining heat from 80 to 85Â °C, making sure it did not go over 90Â °C. Distillate was weighed and percent yield of cyclohexene was determined. An infrared spectroscopy was run on the distillate by taking a drop of distillate and putting it in between two salt plates. Closed the salt plates with metal holders and then put it into the infrared spectroscopy machine. First an infrared spectroscopy was run on the cyclohexanol. Then an infrared spectroscopy was run on the cyclohexene. The Bromine chemical test was run by adding 2 drops of distillate to a test tube. 0. 1 M of bromine in dichloromethane was added to the same test tube. Then added drops of dichloromethane until color appeared if color disappeared the test would have been positive. If the color did not go away the test would have been negative. Finally a Bayer test was run by adding 2-mL of 95% ethanol to a test tube. Two drops of distillate were added to the test tube. Then KMnO4 was added drop wise until color persisted. Results Table 1. Mass of starting solution, sulfuric acid, and ending product formed. Solution| Mass (g)| Cyclohexanol| 4. 512| Sulfuric Acid| 3. 384| Cyclohexene| 1. 217| Table 2. Chemical tests done to determine whether or not the product was cyclohexene. Result seen by changes in color. Type of Test| Color of Starting Reactant| Color of Reactant plus Product| Bromine| Bromine was red| Mixture went from red to clear | Baeyer| KMnO4 was purple| Mixture went from purple to dark brown | Table 3. Infrared spectroscopy peak values representing different structures found for cyclohexanol and cyclohexene. Solution| Alcohol| Single Bonds (sp3 C-H)| Double Bonds(sp2 C=C)| Ring Structure| Cyclohexanol| Peak 13339. 25 cm-1| Peak 2-32930. 94cm-1, 2854. 63cm-1| N/A| Peak 51450. 92cm-1| Cyclohexene| N/A| Peak 8 and 112923. 83cm-1, 2658. 55cm-1| Peak 6-73062. 12cm-1, 3020. 71cm-1| Peak 281438. 15cm-1| The original weight of the cyclohexanol added was 4. 512 g. The original weight of cyclohexanol with sulfuric acid was 7. 896 g. The original weight of the sulfuric acid alone was 3. 384 g. The weight for the product, assumed to be cyclohexene, was 1. 217 g. The percent yield for cyclohexene was calculated to be 26. 97%. Cyclohexanol was distilled fractionally to produce 4-mL of cyclohexene at 88? C. The original cyclohexanol was put through infrared spectroscopy and was found to have a large broad band at 3339. 25(cm-1) indicating the presence of an OH group, large narrow bands at 2930. 94(cm-1) and 2854. 63(cm-1) indicating single bonds between carbon and hydrogen, and a large narrow band at 1450. 92(cm-1) indicating a ring. The cyclohexene was put through infrared spectroscopy which showed that there was no OH group now. This time there was a double bond between carbons at 3062. 12(cm-1) and 3020. 71(cm-1), single bonds between hydrogen and carbon at 2923. 83(cm-1) and at 2658. 55(cm-1), and a ring at 1438. 15(cm-1). The bromine chemical test gave a positive result for cyclohexene after one drop of dichloromethane was added, which changed the liquid from a red color to a clear color. The Bayer test made the substance stay purple after 1 drop showing it was negative for an alkene. Doing the bromine chemical test and the Bayer test on cyclohexanol gave negative results for both. Discussion The fractional distillation was used to dehydrate cyclohexanol collected fraction allowed it to be separated and then was dried. Only 4-mL of cyclohexene was collected from the distillation. Infrared spectroscopy was then used to determine whether the substance retrieved from the distillation was dehydrated and had turned to cyclohexene. Looking at the infrared spectroscopy of the distilled substance there was no broad peak which signifies that there is not an OH in the substance anymore and the substance is not cyclohexanol anymore. To make sure the substance was cyclohexene two different chemical tests were given. The bromine test had a positive result after 1 drop. The Bayer test had a negative result after one drop was added. There was a discrepancy between the two tests but by viewing the IR we can conclude that the substance was no longer cyclohexanol. This could be attributed to error such as the cyclohexanol not being distilled correctly, leaving impurities. The fractions may have been heated too quickly and the fractions may have mixed. There may not have been enough drying agent added to the mixture. Some future possible changes to the experiment would be to have more time to not feel rushed. This way it would be easier to heat more slowly and make sure that everything is clean leaving little to no impurities.

Russia :: essays research papers

When examining the progress of a nation, it is vital to also see what the national psyche behind it was. In Russia the driving motivation was not always consistent. â€Å" ... [They] still had difficulty in formulating and sustaining any permanent concept of the 'state' and its interests independent of the family possessions and connections of the ruling dynasty.†(Hosking 190) As with many countries of that time, the rulers were not held accountable, and often overlooked long-term strategic goals in favor of short-term gains. Foreign policy was more a personal relationship among rulers than among nations; alliances were made, broken or not honored routinely. All of these factors made for a precarious political environment in which any leader had to operate. Russia's own unique problems required its rulers have an even greater political acumen than their purely European counterparts. There in lies the crux of Russia's biggest problems. Over the centuries from - to - Russia has expanded from a small principality to a huge polyglot of an empire; encompassing many people with many different cultures. Most Russians were not European. Although these people came from diverse geographical locations, they all shared certain beliefs that unified them. Concepts such as Pravda, the Mir, and the acceptance of suffering helped unify the empire. When Peter I wanted to Europeanize Russia he did it in a typical Russian way; out with the old, in with the new, having â€Å"... the tendency to introduce reform in total packages, rejecting previous ways as utterly wrong.† (Hosking 176) Peter I replaced the one stable and unifying set of beliefs with another set adopted from a world foreign to most everyone in the empire. This may be the reason that Russia’s Europeanization seemed to be a thin veneer under which the majority of Russians did not understand or see any benefit in europeanization. To answer the question as to whether or not Peter I was a successful ruler, it must be stated that the premise under which he ruled was â€Å"... To increase [Russia's] power and wealth and to improve the well being of its people.†(Hosking 198) To Peter that meant becoming more like Europe, and perhaps he thought this because of the great European influences on his, and on the lives of his advisors and the nobility in general. Peter saw the great armies and bureaucracies of Europe and wished to install them in Russia.

1000 Words on Proper Uniform

The Importance of obeying orders and being on time for duty. There are many reasons why a soldier, (doesn't matter the rank) should obey orders from anyone above him or her in the chain of command. Sometimes its good to listen to people soldiers below you too because they maybe smarter at the task then you are. One reason is that the military is revolved around higher ranking soldiers leading the lower ranking soldiers, they’re more experienced in the military then I am and been deployed more than i have.If everyone in the military just did their own thing then we wouldn't be a successful army and then our country wouldn't be as strong as it is. Every higher up gives an order for a reason, we may not like the reason but in the end most of the orders and decisions will be smart ones i guarantee. We were taught as children to obey our higher-ups. Starting from our parents, teachers, managers, police officers and etc†¦ So how does this relate to the military?Well, when a per son enlists in the United States Military, active duty or reserve, they take the following oath, â€Å"I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic that I will bear true faith and allegiance to the same and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. Right there you are making a promise to the United States Military. Before you or I even put on the uniform, you promise you’ll obey the orders of the President and the orders of the officers appointed over you. Military discipline and effectiveness is built on the foundation of obedience to orders. Brand new privates are taught to obey, immediately and without question, orders from their superiors, right from day one of boot camp. Almost every soldier can tell you that obedience was drilled into their heads at one point in Basic Training.For example, no talking in the chow line, don’t talk with your hands, head and eyes forward, no smiling, stand a parade rest, and of course the famous â€Å"Yes Drill Sergeant / No Drill Sergeant†. Those are just the simple orders you are made to obey in the military. Greater orders mean bigger consequences. Military members who fail to obey the lawful orders of their superiors risk serious consequences. Military discipline and effectiveness is built on obedience to orders.Recruits are taught to obey, immediately and without question, orders from their superiors, right from day-one of boot camp. Which is why we work so well by following orders from the more experienced leaders who have been doing this for years? We have plenty of obedience in Bravo Company and I feel it is one of the best companies in the unit. It has made me want to pursue a career in the military and I know rules and regulations is what am going to make me move up the ranks and make me an all around better soldier.I know I need to work on discipline sometimes and I am doing corrective training right now to make me become a better soldier. So in my essay I have listed many characteristics which in the history and present day made what the army is today. I feel the army values have a big role in rules and regulations because if you follow the values you will not stray off in being disobedient. It's very important to follow directions, or else the world would be in chaos.When some tells you that you must follow directions so that everything can go in an orderly fashion, it's important do because they know what's going to happen if you don't. It's important to follow directions because if you don't something can go wrong, its important follow directions because if you don't you will get in trouble, and it is also important to follow directions because if you don't you'll be writing this essay too. It is important to follow directions beca use if you don't something can go wrong.If you decide to cross the street and someone tells you not to, their telling you for a reason, maybe so that you won't get hit by a car or get shot at in a drive by shooting. It's important follow directions because if you don't you'll get in trouble, if you decide to cross the street after they told you not to, you'll suffer. The importance of reporting on time to the soldiers appointed place of duty is not a task to be taken lightly.Every soldiers has important tasks set out for them no matter what the individual soldier may think about why they are doing that particular job it must be done for a reason that may not be told to that soldier until the task is complete. Reporting to the task on time and in the correct uniform is not to be taken lightly because if that soldier is late to their assigned task then that would mean that a different soldier would have to take the late soldiers place until they rrive which might not seem like a lot t o some people but what if that soldier who was not late had and in most cases would have their own tasks to complete. Now were talking about not just one soldier but a whole organization not functioning the way that it should be or taking more time than it should have to accomplish those few simple tasks. The same thing applies when a soldier is at his appointed place of duty on time but not in the correct uniform then your talking about taking more time to go home get into the correct uniform and hurry back which would be the same thing as showing up late.

Analytical Essay If I Were An Animal Would You Eat...

HLTC50 Assignment 2, Analytical Essay on Prompt 2: â€Å"If I Were an Animal, Would You Eat Me?† There is a common English idiom: â€Å"A picture speaks a thousand words.† Art is a powerful tool that can cross cultural barriers and connect strangers without speaking a word. It can also make us question about our society and see the world with different eyes – including the eyes of another species. Paintings are influential in raising awareness of the social problems regarding the human-animal interface by allowing us to be alert to human conditions and be critical on our definition of morality and what makes us human. A painting by Sue Coe illustrates the disturbing reality of animal farming by comparing it with human enslavement. Her provocative†¦show more content†¦Sue Coe brilliantly painted a connection between human and non-human and questioned about the boundaries that separates the human from the animal. The pig is being dragged away by the two men, but shown to be standing on her two feet. In the study of biology and evolution, humans (specifically Homo sapiens) are identified and separated from other species by having bipedal locomotion. In other words, they are capable of standing and walking upright on their two feet. Thus interestingly Sue Coe broke the barrier by giving a humanistic personification to the pig by making her stand vertically between the butchers. It gives uncomfortable thoughts on what if the butcher was holding onto the arms of a human in this particular situation? Undeniably, the audience is tackled with problem on morality. Through the approach of using anthropomorphism on the farm animal, Sue Coe was able to create empathy between the individual and the pig. The personification of the pig challenges the person to revaluate their identity as a human and pounder what makes the human different from the non-human. How would we react if there was human farming in the place of an animal slaughterhouse? Similarly to Sue Coe’s method of giving personhood to the pig, Sunaura Taylor uses painting to display the opposite to when a human becomes a farm animal. Particularly to the painting called â€Å"Self-Portrait Marching with Chickens† Taylor submerges herself into the field and uses her body to re-enacts the