Chapter 3, Problem 5PP

PRACTICE PROBLEM 3.5

Formic acid $\left({\text{HCO}}_{\text{2}}\text{H}\right)$ has $K_{\text{a}}=\text{1}\text{.261}\times {\text{0}}^{-10}$. (a) What are the molar concentrations of the hydronium ion and formate ion $\left({\text{HCO}}_2^{-}\right)$ in a 0.1 M aqueous solution of formic acid? (b) What percentage of the formic acid is ionized?