The best way to titrate weak acid is by back titration, using the suitable indicator.
You first add a known amount of a strong alkali and titrate the "overdose".

WHATEVER wrote:

> I wonder how many of you using acid stoper during developing of dry film?
> say citric acid. and I would like to hear your comments. For those chemists
> out there, I like to know whether it is really possible to titrate a weak
> acid with three Ka ?
>
> Oh, by the way, anyone using resist lamintor with two sets of rollers, hot
> to hot; Like to try or modify a one, if you have some information, would you
> please share  with me?
>
> Thanks.
>
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