## Chemistry 9th Edition

a. HCl b. $HNO_2$ c. $HCN$
a. $HCl$ has a greater $K_a$ value than $H_2O$. Therefore, $HCl$ is stronger. b. $HNO_2$ has a greater $K_a$ value than $H_2O$. Therefore $HNO_2$ is stronger. c. $HCN$ has a greater $K_a$ value than $HOC_6H_5$. Therefore, $HCN$ is stronger.