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I would strongly suggest you dilute the 95% acetic acid, or use only a very small amount of it... If not, you might need more sodium hydroxide later on to achieve pH 13 in the basic phase...

60 ml of 5% vinegar contains approx. 3 gr of acetic acid...
If you have 95% acetic acid, it would take a little bit more than 3 ml to achieve desired pH in acidic phase (if undiluted)...
If you don't dilute you may have to add extra water in a later stage of the extraction (or your basic mix will be too viscous) so why not dilute it to start with?

So far for my 2 cents...

[QUOTE="dooby, post: 3653257, member: 24124"] I would strongly suggest you dilute the 95% acetic acid, or use only a very small amount of it... If not, you might need more sodium hydroxide later on to achieve pH 13 in the basic phase... 60 ml of 5% vinegar contains approx. 3 gr of acetic acid... If you have 95% acetic acid, it would take a little bit more than 3 ml to achieve desired pH in acidic phase (if undiluted)... If you don't dilute you may have to add extra water in a later stage of the extraction (or your basic mix will be too viscous) so why not dilute it to start with? So far for my 2 cents... [/QUOTE]