Homework Help: AP chemistry

Posted by Anonymous on Sunday, October 24, 2010 at 8:29pm.

A solution of sodium hydroxide is standard-
ized against potassium hydrogen phthalate
(KHP, formula weight 204.2 g/mol). From
the following data, calculate the molarity of
the NaOH solution: mass of KHP 1.894 g;
buret reading before titration 0.13 mL; buret
reading after titration 32.57 mL.
Answer in units of M.

AP chemistry - DrBob222, Sunday, October 24, 2010 at 9:36pm
moles KHP = grams/molar mass
Substitute and solve for mols.

KHP + NaOH ==> NaHP + H2O
so the reaction is 1:1 and moles KHP = moles NaOH.
Then M NaOH = moles NaOH/L NaOH.
To obtain L NaOH, you will need to subtract the final buret reading - initial buret reading and convert to L.
AP chemistry - Anonymous, Sunday, October 24, 2010 at 10:45pm
Do I use the molar mass of just KHP or with H2O as well?
AP chemistry - guerra, Thursday, August 2, 2012 at 2:58am
mols of solute therefore just KHP

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