Consider the compounds water, ethylamine, acetone, and aniline, whose Kb values can be found here. Classify them by whether they can be appreciably (Keq>1) protonated by: pyridinium, CH3OH2 , both, or neither.
Acetone = CH3C(=O)CH3
Ethylamine = CH3CH2NH3
Water = H2O
Aniline = C6H5NH2