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Difference between acid number and saponification number

Accepted Answer

The acid number is the number of milligrams of potassium hydroxide (KOH) required to neutralize the free acids in 1 gram of fat or oil. The saponification value is the number of milligrams of KOH required to saponify 1 gram of fat or oil. Saponification is the hydrolysis of an ester by a base to form a salt of the fatty acid and an alcohol. The acid number is a measure of the free fatty acid content of a fat or oil, while the saponification number is a measure of the total fatty acid content of a fat or oil.

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