posted by Broy on .
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 1.654 g;
buret reading before titration 0.23 mL; buret
reading after titration 47.07 mL.
Answer in units of M
KHP + NaOH ==> NaKP + H2O
So 1 mole KHP uses 1 mole NaOH.
moles KHP = grams/molar mass. Calculate moles KHP
Then moles NaOH = moles KHP
M NaOH = moles NaOH/L NaOH.
(mL NaOH used = final reading - initial reading, then convert to liters.)