A- It is a weak base. Which equilibrium corresponds to the equilibrium constant Kb?
A- (aq) + H2O (l) ⇌ HA (aq) + OH- (aq)
A- (aq) + H3O+ (aq) ⇌ HA (aq) + H2O (l)
HA (aq) + OH- (aq) ⇌ H2O (l) + H+ (aq)
HA (aq) + H2O (l) ⇌ H2A+ (aq) + OH- (aq)
A- (aq) + OH- (aq) ⇌ HOA2- (aq)