Part 2) Standardize the NaOH solution.
NaOH is a hygroscopic solid, which means that it can absorb water from its surroundings, therefore it is important to
determine the actual concentration of the sodium hydroxide solution. To do this the sodium hydroxide solution is titra
with potassium hydrogen phthalate, (KHC8H404, Molar mass = 204.23g/mol). KHP is a stable monoprotic solid acid. 1.
grams of potassium hydrogen phthalate was dissolved into 100.0 mL of water, 2 drops of indicator was added. This wa
titrated with the sodium hydroxide solution that was made in part 1. The initial reading of the buret was 1.23 mL. and a
equivalence point in the titration 28.74 mL was the reading on the base buret.
NaOH(aq) + KHC8H404 (aq) NaKC8H4O4(aq) + H2O(1)
OH(aq) + HC8H404 (aq)=C8H4042 (aq) + H2O
4
I
B) How many moles of KHP were used?
C) What volume of NaOH was needed?
D) What it the molarity of the standardized NaOH solution?
