(a) Given that $K_{b}$ for ammonia is $1.8 \times 10^{-5}$ and that for hydroxylamine is $1.1 \times 10^{-8}$, which is the stronger base? (b) Which is the stronger acid, the ammonium ion or the hydroxylammonium ion? (c) Calculate $K_{a}$ values for $\mathrm{NH}_{4}{ }^{+}$ and $\mathrm{H}_{3} \mathrm{NOH}^{+}$.