Posted by Matt on Thursday, November 1, 2007 at 9:20pm.
You probably intended this to be potassium hydrogen phthalate which I will rewrite, to make things simpler, as KHP. The H is the hydrogen neutralized by the NaOH.
NaOH + KHP ==> NaKP + H2O.
mols KHP = 1.029 grams/molar mass KHP.
mols NaOH = mols KHP.
mols NaOH = L x M. You know mols and you know L. M is the only unknown.
The second part of the problem is done by working backwards. Using the molarity of the NaOH calculated above, use mols = L x M and plug in , say 38 mL (0.038 L or about half way between 35 and 40). That allows you to calculate mols. Then use mols KHP and mols KHP = grams/molar mass. You know mols KHP and you know molar mass so calculate grams KHP.
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