The term “Ka for the ammonium ion” describes the equilibrium constant for which of the following reactions?
1. NH3 + H3O+ ⇌ NH4+ + H2O
2. NH3 + H2O ⇌ NH4+ + OH−
3. NH4+ + OH− ⇌ NH3 + H2O
4. NH4+ + H2O ⇌ NH3 + H3O+
5. The term is misleading, because the ammonium ion is not an acid.
6. NH4Cl(solid) + H2O ⇌ NH4+ + Cl−
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