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Microbial Enzymes and Organic Acids

Acetic acid i...

Question

Acetic acid is bleached with the help of ___.

A

cyanide

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B

sodium hydroxide

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C

potassium hydroxide

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D

potassium ferrocynide

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Solution

The correct option is D potassium ferrocynide
Mixture of bacterial strains like Acetobacter and Glucanobacter is mixed with ethanol for its microbial degradation. Acetic acid and other by-products are obtained through it. Acetic acid is separated from mixture by rarefaction. Acetic acid is bleached with the help of potassium ferrocynide.

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Q. The sample is dissolved in hot con.

H C l

and add few drops of

N H_{4} O H

, then acidified with dil. Acetic acid + few drops of potassium ferrocyanide solution. The precipitate is obtained. Guess the color of precipitate.

Q. The sample is dissolved in hot con.

H C l

and add few drops of

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, then acidified with dil. Acetic acid + few drops of potassium ferrocyanide solution. The precipitate obtained is chocolate brown in colour. Guess the presence of element present :

Q. Calculate the percentage of available chlorine in a given sample of bleaching powder from the following data.

3.55 g

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liberated iodine which required

60 m L

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Q. Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

25 mL of household bleach solution was mixed with 30 mL of 0.50 M KI and 10 mL of 4N acetic acid. In the titration of the liberated iodine, 48 mL of 0.25 N

N a_{2} S_{2} O_{3}

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