Ionization Constants of Weak Bases

Base Lewis Structure Kb at 25 °C
ammonia  [latex]1.8\times {10}^{-5}[/latex]
dimethylamine   [latex]5.9\times {10}^{-4}[/latex]
methylamine   [latex]4.4\times {10}^{-4}[/latex]
phenylamine (aniline)   [latex]4.3\times {10}^{-10}[/latex]
trimethylamine   [latex]6.3\times {10}^{-5}[/latex]