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ICSE Class 10 Chemistry Question 40 of 93

Organic Chemistry — Question 30

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Question

Question 3(2012)

(i) Why is pure acetic acid known as glacial acetic acid?

(ii) Give a chemical equation for the reaction between ethyl alcohol and acetic acid.

Answer

(i) Anhydrous acetic acid on cooling below 16.5°C, crystallizes out in the pure form, forming a crystalline mass resembling ice [m.p. around 17°C] . Hence, pure acetic acid is called glacial acetic acid.

(ii) Reaction between ethyl alcohol and acetic acid:

C2H5OHethyl alcohol+CH3COOHacetic acid→Conc. H2SO4CH3−COO−C2H5ethyl acetate+H2O\underset{\text{ethyl alcohol}}{\text{C}_2\text{H}_5\text{OH}} + \underset{\text{acetic acid}}{\text{CH}_3\text{COOH}} \xrightarrow{\text{Conc. H}_2\text{SO}_4} \underset{\text{ethyl acetate}}{\text{CH}_3-\text{COO}-\text{C}_2\text{H}_5} + \text{H}_2\text{O}