Chapter 9, Problem 9.74P

Label the acid in the reactants and the conjugate acid in the products in each reaction. Use the data in Tables 9.2 and 9.3 to determine whether the reactants or products are favored at equilibrium. Explain your reasoning.
a. $\text{HF}(g){\text{ + NH}}_3(g)\rightleftarrows {\text{NH}}_{\text{4}}{}^{-}(aq){\text{ + F}}^{-}(aq)$
b. ${\text{Br}}^{-}(aq){\text{ + H}}_2\text{O}(l)\rightleftarrows \text{HBr(}aq){\text{ + OH}}^{-}(aq)$
c. $\text{HCN}(aq){\text{ + HCO}}_3{}^{-}(aq)\rightleftarrows {\text{H}}_{\text{2}}{\text{CO}}_3(aq){\text{ + CN}}^{-}(aq)$

Table 9.2 Relative Strength of Acids and Their Conjugate Bases

Table 9.3 Acid Dissociation Constants $(K_a)$ for Common Weak Acids