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The term "Ka for the ammonium ion" describes the equilibrium constant for which of the following reactions? a) NH4^+ + H2O ⇌ NH3 + H3O^+ b) NH4^+ + OH ⇌ NH3 + H2O c) NH4Cl(solid) + H2O ⇌ NH4^+ + Cl^- d) NH3 + H2O ⇌ NH4^+ +OH^-