−
Acidity is frequently expressed as the Acid Value, which is the number of mg of potassium hydroxide required to neutralize the free acids in 1.0 g of the substance<ref>Warth, A. H.; The Chemistry and Technology of Waxes. Reinhold Publishing Corporation. Second Edition, p. 586</ref>
+
Acidity is frequently expressed as the Acid Value, which is the number of mg of potassium hydroxide required to neutralize the free acids in 1.0 g of the substance<ref>Warth, A. H.; The Chemistry and Technology of Waxes. Reinhold Publishing Corporation. Second Edition, p. 586</ref>.
          
=Methods=
 
=Methods=
 +
The acid value of a wax is determined by dissolving a known amount of the wax in alcohol and titrating the solution against standard alkali solution.
   −
The acidity of fats and fixed oils in USP may be expressed as the number of mL of  0.1 N alkali required to neutralize the free acids in 10.0 g of substance.
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[[File:Acid_reaction.jpg|380x380px|centro|]]
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==USP 401==
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The acidity of fats and fixed oils in USP may be expressed as the number of mL of  0.1 N alkali required to neutralize the free acids in 10.0 g of substance<ref>Pharmacopedia/National Formulary. US., Vol. 1, 2009, p. 150</ref>.
   Exception encountered, of type "Error"