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April 19, 2014

Homework Help: chemistry

Posted by 1/2 equivalence point on Saturday, July 30, 2011 at 7:25pm.

A 25.00 mL sample of 0.4 M dimethylamine (CH3)2NH is titrated with 0.150 M HCl.

What is the pH at the half-equivalence point?

Not sure what to do here exactly, I'm bad with the titration problems.

I know there are normally a couple tables (finding the number of moles at the equivalence point, using this to find concentrations, etc.) but with titrations I never can seem to get the reactions right.

Also I don't rememer the relevance of the half equilvance point. Is it where pH=pKa? I know there's some relevance to the half equivalence point, I just don't recall what it is.

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