https://www.waxpedia.org/wiki/index.php?action=history&feed=atom&title=Acid_valueAcid value - Revision history2026-05-05T20:38:57ZRevision history for this page on the wikiMediaWiki 1.26.3https://www.waxpedia.org/wiki/index.php?title=Acid_value&diff=157&oldid=prevWikimc: Página creada con «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>Wart...»2013-08-15T17:16:32Z<p>Página creada con «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>Wart...»</p>
<p><b>New page</b></p><div>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>.<br />
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=Methods=<br />
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.<br />
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[[Archivo:Acid_reaction.jpg|380x380px|centro|]]<br />
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==USP 401==<br />
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>.<br />
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Weigh 3 g of sample and place it in a clean 250 mL Erlenmeyer flask. Place 50 mL of solvent (isopropyl alcohol-toluene 5:4) connect the flask with a suitable condenser and warm slowly, with frequent shaking, until the sample dissolves. Remove the flask from the condenser and add 1 mL of phenolphthalein in isopropyl alcohol.<br />
Shake vigorously while titrating with 0.1 N potassium hydroxide. Register the volume of potassium hydroxide consumed.Calculate Acid value by the formula:<br />
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[[Archivo:Diapositiva1.JPG|180x180px|centro|]]<br />
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Which:<br />
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56.11: is the molecular weight of potassium hydroxide<br />
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V: is the volume in mL<br />
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N: is the normality of the potassium hydroxide solution<br />
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W: is the weight, in g, of the sample taken<br />
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==Referencia==<br />
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<references /></div>Wikimc