Chapter 3, Problem 96QRT

Potassium hydrogen phthalate, KHC₈H₄O₄, is used to standardize solutions of bases. The acidic anion reacts with bases according to this net ionic equation:

${\text{HC}}_{\text{8}}{\text{H}}_{\text{4}}{\text{O}}_4^{-}\left(\text{aq}\right)+{\text{OH}}^{-}\stackrel{}{\to }{\text{ H}}_{\text{2}}\text{O}(\ell )+{\text{C}}_{\text{8}}{\text{H}}_{\text{4}}{\text{O}}_4^{2-}\left(\text{aq}\right)$

A 0.902-g sample of potassium hydrogen phthalate requires 26.45 mL NaOH to react; determine the molarity of the NaOH.