# 10.9: Ionization Constants of Weak Bases


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