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Introduction to Aldehydes and Ketones

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Question

Explain the preparation of acetic acid by quick vinegar process with diagram :

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Solution

Preparation of Acetic acid by Quick Vinegar process : In this process, a dilute aqueous solution of ethyl alcohol is oxidized in prescence of enzyme microderma aceti.
In this process, a wooden vat is fitted with two wooden plates having holes. Between these plates is filled by beech wood savings, moistened with old vinegar solution which is the chief source of mycoderma aceti. A $10 %$ aqueous solution of ethyl alcohol is dropped slowly from the top of the vat and air is passed at a controlled rate through the holes near the bottom of the vat. Ethyl alcohol is oxidized to acetic acid. This process is called quick vinegar process because vinegar is formed very quickly.
Reaction with Chlorine
$C H_{3} C O O H + 3 C l_{2} \to C C l_{3} C O O H + 3 H C l T r i c h l o r o A c e t i c a c i d$

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Q. Explain the Quick Vinegar Process of the manufacture of Acetic Acid under the following headings:
(i) Principle and Equation
(ii) Labelled diagram.

Q. Describe the preparation of acetic acid through quick-vinegar process in following points:
(a) Diagram,
(b) Method,
(c) Equation of preparation,
(d) Any one precaution.

Q. Describe with diagram the quick vinegar process for preparation of

C H_{3} C O O H

and write its reaction with

C_{2} H_{5} O H

Q. Assertion :Liquefaction of acetic acid leading to formation of glacial acetic acid. Reason: Vinegar is roughly 3%-5% acetic acid by volume, making acetic acid the main component of vinegar apart from water.

Vinegar is an acid with its key ingredient, acetic acid. It is widely used for food preservation and cooking. The acetic concentration for table vinegar is typically

5 %

whereas higher concentration upto

18 %

is used as preservative. The word "vinegar" is derived from vin aigre, meaning "sour wine".

A table vinegar sample contains

5 %

(mass/mass) of acetic acid.

10 m L

of the above sample should be diluted to prepare

0.10 M

acetic acid solution. (density

1.05 g m L^{- 1}

, Molar mass of

C H_{3} C O O H - 60.0 g m o l^{- 1}

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