Based on Ka values, is OH- stronger or NH3 stronger as bases?

Question

Based on K_a values, is OH^- stronger or NH₃ stronger as bases?

Answer 1

Not sure of Ka values, but if you look at the structures of the conjugate acids (H2O vs NH4+), H2O is more stable and thus would be a stronger base. If you find those values, OH- should have a lower Ka value than NH3.