An impure sample of potassium hydrogen phthalate, KHP, having a mass of 84.02 g was dissolved in water. This acid sample was neutralized by the addition of 536.0 mL of 0.125 M NaOH.
NaOH(aq) + KHP(aq) ? NaKP(aq) + H2O(l)
How many mol of NaOH and KHP were used in the reaction? and what is the percentage purity of the KHP? Be sure to enter your answer in %.