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Topic: Acid Value test  (Read 1801 times)

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Offline mandytan

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Acid Value test
« on: October 15, 2012, 05:46:36 PM »
Hi,
For Acid Value test,most methods that follow the pharmacopoeia use ethanol-ether mixture. There are a few methods that use just ethanol. It seems that for some ester samples,the pink colour endpoint is difficult to detect but when ethanol-ether mixture is used, the pink colour endpoint is clear.

Why is this so? What is the chemistry of using the ethanol-ether mixture since the samples can be dissolved completely in ethanol?

Thank you.

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