Chapter 4, Problem 94E

Potassium acid phthalate, ${\text{KNaC}}_8{\text{H}}_4{\text{O}}_4$, or KHP, is used in many laboratories, including general chemistry laboratories, to standardize solutions of base. KHP is one of only a few stable solid acids that can be dried by warming and weighed. A 0.3420-g sample of ${\text{KNaC}}_8{\text{H}}_4{\text{O}}_4$ reacts with 35.73 mL of a NaOH solution in a titration. What is the molar concentration of the NaOH?

${\text{KNaC}}_8{\text{H}}_4{\text{O}}_4\left(aq\right)+\text{NaOH}\left(aq\right)\to {\text{KNaC}}_8{\text{H}}_4{\text{O}}_4\left(aq\right)+{\text{H}}_2\text{O}\left(aq\right)$