Chapter 9, Problem 9.114P

Calculate the pH of a bicarbonate/carbonate buffer in which the concentration of sodium bicarbonate $\left({\text{NaHCO}}_{\text{3}}\right)$ is always 0.20 M, but the concentration of sodium carbonate $\left({\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}\right)$ corresponds to each of the following values: $\left(\text{a}\right)\text{ 0}\text{.20 M; }\left(\text{b}\right)\text{ 0}\text{.40 M; }\left(\text{c}\right)\text{ 0}\text{.10 M}\text{.}$