Posted by Karen on Sunday, October 7, 2012 at 12:21am.
I will assume that this is a titration problem. You know the mass of the KHC8H4O4 (potssium hydrogen phthalate) and you titrated that mass with NaOH.
mols phthalate = grams/molar mass.
Since the equation is 1:1 (1 mol phthalate to 1 mol NaOH) the mols NaOH = mols phthalate
Then you want to determine M NaOH. That is M NaOH = mols NaOH/L NaOH.
In the future you should be aware that it is easier to answer a specific question than a general question. I had to guess what you were doing in order to answer your question.
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