Chapter 9, Problem 9.112P

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. $\text{0}{\text{.55 M CH}}_{\text{3}}\text{COOH and 0}{\text{.55 M NaCH}}_{\text{3}}\text{COO}$
b. $\text{0}{\text{.15 M NaH}}_2{\text{PO}}_{\text{4}}\text{ and 0}{\text{.15 M Na}}_{\text{2}}{\text{HPO}}_{\text{4}}$