Chapter 9, Problem 9.111P

Using the $K_a$ values in Table9.6, calculate the pH of a buffer that contains the givenconcentrations of a weak acid and its conjugate base.
a. $\text{0}{\text{.10 M Na}}_{\text{2}}{\text{HPO}}_{\text{4}}\text{ and 0}{\text{.10 M Na}}_{\text{3}}{\text{PO}}_{\text{4}}$
b. $\text{0}{\text{.22 M NaHCO}}_{\text{3}}\text{ and 0}{\text{.22M Na}}_{\text{2}}{\text{CO}}_{\text{3}}$