organic chemistry. lab seperation of acid from neutral substance EXPERIMENT 11:
ID: 555135 • Letter: O
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organic chemistry. lab seperation of acid from neutral substance
EXPERIMENT 11: SEPARATION OF ACID FROM NEUTRAL SUBSTANCE 119 3. What are the precautions on working with ether? 4. The carboxylic acid is to be recrystallized in methyl ethyl ketone. Explain how it can be purified if all you do is dissolve it and then let it solidify again. Presumably you start with a contaminated product and end with a pure one. Why would the final product be any purer than what you started with as a crude product by following the steps in recrystallization?Explanation / Answer
Recrystallization : It is a technique of purifying organic compound which is dissolved and again crystallizes from neutral solvent.
In our experiment, contaminated carboxylic acid is redissolved in ethyl methyl ketone which is used as neutral solvent.
The solution is boiled to dissolve all the acid and impurities in ketone. After some time, solution allow to cool.
During course of cooling our acid crystallizes from solution leaving behind impurities in solution. Impurities won't crystallizes, before acid. Thus, acid is crystallizes as solid and impurities remains dissolved in solution.
After crystallization, the solution is filtered to separate acid crystals from solution. This filtration process can be repeated two to three time to get more pure crystals of acid. At this point we get pure carboxylic acid.
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