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The '''acid number''' in [[chemistry]] is the mass of [[potassium hydroxide]] in [[milligrams]] that is required to neutralize one gram of [[chemical substance]]. The acid number is a measure of the amount of [[carboxylic acid]] groups in a chemical compound for instance a [[fatty acid]]. In a typical procedure a known amount of sample dissolved in organic solvent is [[titration|titrated]] with a solution of potassium hydroxide with known [[concentration]] and with [[phenolphthalein]] as a color indicator.
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