Question

I'm determining the % Purity of KHP in an unknown sample. I have done two titrations: one with pure KHP titrated against a NaOH 0.1M solution, and the other is an unknown purity of KHP also titrated against a NaOH 0.1M solution. I am having trouble finding the percent purity of KHP, my professor said to recalculate my results because mine were too high (47.5%). Please help!!!

Unknown Titration

Trial	Weight	Initial Volume (mL)	Final Volume (mL)
1	1.2030	1.37	27.63
2	1.2408	2.98	27.45
3	1.2807	3.61	26.67
4	1.2443	0.78	24.45

Titration with pure KHP

Trial	Weight (g)	Volume used in titration (mL)	# moles	Concentration
1	0.7874	34.97	3.85x10^-3	0.110
2	0.7410	27.78	3.63x10^-3	0.131
3	0.7293	33.70	3.57x10^-3	0.106
4	0.7008	32.24	3.43x10^-3	0.106

Answer 1