Which term describes a substance that increases the concentration of hydroxide ions in solution?

Identify the Lewis acids and bases in the following reactions.

a) H⁺ + OH^– ⇌ H₂O

b) Cl^– + BCl₃ ⇋ BCl₄^–

c) SO₃ + H₂O ⇌ H₂SO₄

Identify each of the following compounds as either a Lewis acid, a Lewis base or neither.

a)  ZnCl₂                                                                                                           b)  CN ^–

c)  NH₄⁺                                                                                                           d) Co³⁺

Identify the Lewis acid and Lewis base in the following reaction.

CaO (s) + CO₂ (g) → CaCO₃ (g)

Which of these definitions could be used to define SO₂ as a base? Check all that apply.