Write the ionization equation and the \(K_{\mathrm{a}}\) expression for each of the following acids. (a) \(\mathrm{PH}_{4}{ }^{+}\) (b) \(\mathrm{HS}^{-}\) (c) \(\mathrm{HBrO}_{2}\)

Question: Write the ionization equations and the \(K_{\mathrm{a}}\) expressions for the following acids: (a) \(\mathrm{PH}_{4}{ }^{+}\), (b) \(\mathrm{HS}^{-}\), and (c) \(\mathrm{HBrO}_{2}\). Answer: (a) Ionization Equation for \(\mathrm{PH}_{4}{ }^{+}\): $$ \mathrm{PH}_{4}{ }^{+} (aq) \rightleftharpoons \mathrm{P}(aq) + \mathrm{H}_{3}{ }^{+}(aq) $$ \(K_{\mathrm{a}}\) Expression for \(\mathrm{PH}_{4}{ }^{+}\): $$ K_{\mathrm{a}} = \frac{[\mathrm{P}][\mathrm{H}_{3}{ }^{+}]}{[\mathrm{PH}_{4}{ }^{+}]} $$ (b) Ionization Equation for \(\mathrm{HS}^{-}\): $$ \mathrm{HS}^{-} (aq) \rightleftharpoons \mathrm{S}^{2-}(aq) + \mathrm{H}_{3}{ }^{+} (aq) $$ \(K_{\mathrm{a}}\) Expression for \(\mathrm{HS}^{-}\): $$ K_{\mathrm{a}} = \frac{[\mathrm{S}^{2-}][\mathrm{H}_{3}{ }^{+}]}{[\mathrm{HS}^{-}]} $$ (c) Ionization Equation for \(\mathrm{HBrO}_{2}\): $$ \mathrm{HBrO}_{2}(aq) \rightleftharpoons \mathrm{BrO}_{2}^{-}(aq) + \mathrm{H}_{3}{ }^{+}(aq) $$ \(K_{\mathrm{a}}\) Expression for \(\mathrm{HBrO}_{2}\): $$ K_{\mathrm{a}} = \frac{[\mathrm{BrO}_{2}^{-}][\mathrm{H}_{3}{ }^{+}]}{[\mathrm{HBrO}_{2}]} $$