Question

The 'acid value' of an oil or fat is measured in terms of weight of
A. $N{{H}_{4}}OH$
B. $NaOH$
C. $KOH$
D. $C{{H}_{3}}COOH$

Answer 1

Hint: To answer this question we have to know about the acid value of fat and oil. The acid value is defined as the number of one milligram of potassium hydroxide required to neutralise one gram of the oil or fat.

Complete Step by Step Solution:
The acid value is defined as the number of one milligram of potassium hydroxide required to neutralise one gram of the oil or fat. Thus 'acid value' of an oil or fat is measured in terms of weight of $KOH$. The acid value of an oil or fat is determined by titrating a solution of the oil or fat in the diethyl ether with potassium hydroxide.
Thus we can write that the 'acid value' of an oil or fat is measured in terms of weight of $KOH$. .
Thus the correct option is C.

Additional information: An oil is a nonpolar substance. It is composed primarily of hydrocarbons. It can be both hydrophobic and lipophilic. Oils are usually flammable and surface active substances. Most of the oils are unsaturated lipids that are present as a liquid at room temperature. Fats have the same property as oil but it exists as a solid at room temperature. Both fat and oil are made of glycerol.

Note: The acid value of oil and fat is determined using potassium hydroxide. The acid value is a measure of rancidity. It is normally formed during decomposition of triglyceride.