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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: aamaha on November 20, 2024, 09:31:21 AM

Title: Free Alkali/Free Acid Analysis in Calcium Soap
Post by: aamaha on November 20, 2024, 09:31:21 AM

Hi There!

So I make calcium soap, i want to check the free alkali / free acid of the soap.
I have checked with method from AOCS using titration with ethanol as the solvent. But i got problem, because calcium soap can not dissolve in ethanol. therefore, i'm not sure whether my analysis is true or not. Is there any other method to check the free alkali/free acid for Calcium Soap?

Title: Re: Free Alkali/Free Acid Analysis in Calcium Soap
Post by: Borek on November 20, 2024, 10:16:01 AM

The solid is inert, you don't need it to dissolve.

You want to dissolve/extract free alkali or acid, so that they can be titrated. Presence of the leftover solid should not interfere with the process.