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acid number

American  

noun

Chemistry.

  1. a number expressing the acidity of a substance, equal to the number of milligrams of potassium hydroxide needed to neutralize the free fatty acids present in one gram of the substance.

Example Sentences

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For a more exact expression of the free acid in a given fat, the committee recommends that the ratio of acid number to saponification number be used.

From Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. by Thomssen, E. G.

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