How to check the purity of glacial acetic acid?

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William Letter

Determine the freezing (melting) point (pure acetic acid ~ 16.7 C) or alternatively you could titrate it against a base. I recall we did this in college chemistry class (determined the freezing point of an unknown concentration of acid solution to determine purity/conc). You can probably find examples using a keyword search online.

Detlef Jensen

Glacial acid contains 1% or less water. I am not sure if the Karl Fisher titration works under those conditions. However you might find this article from 1921 interesting:

https://link.springer.com/article/10.1007/BF01381843

Cheers

Detlef.