Chapter 2, Problem 45P

What is $K_{\text{a}}$ for each compound? Use a calculator when necessary.

a. $\begin{array}{l}{\text{H}}_{\text{2}}\text{S}\\ \text{p}{K}_{\text{a}}=7.0\end{array}$

b. $\begin{array}{l}{\text{ClCH}}_{\text{2}}\text{COOH}\\ \text{p}{K}_{\text{a}}=2.8\end{array}$

c. $\begin{array}{l}\text{HCN}\\ \text{p}{K}_{\text{a}}=9.1\end{array}$