Identify the acid-base conjugate pairs in each of the following reactions. (Select all that apply.)
(a) CH3COO− + HCN equilibrium reaction arrow CH3COOH + CN −
CH3COOH (acid) and CN - (base)
HCN (acid) and CN - (base)
HCN (acid) and CH3COOH (base)
CH3COO- (acid) and CN - (base)
HCN (acid) and CH3COO- (base)
CH3COOH (acid) and CH3COO- (base)

(b) HCO3− + HCO3− equilibrium reaction arrow H2CO3 + CO32-
H2CO3 (acid) and HCO3- (base)
HCO3- (acid) and CO32- (base)
CO3- (acid) and HCO3- (base)
HCO3- (acid) and HCO3- (base)
CO32- (acid) and HCO3- (base)
H2CO3 (acid) and CO32- (base)

(c) H2PO4− + NH3 equilibrium reaction arrow HPO42- + NH4+
H2PO4- (acid) and NH4+ (base)
NH4+ (acid) and HPO42- (base)
HPO42- (acid) and NH3 (base)
H2PO4- (acid) and NH3 (base)
H2PO4- (acid) and HPO42- (base)
NH4+ (acid) and NH3 (base)

(d) HClO + CH3NH2 equilibrium reaction arrow CH3NH3+ + ClO−
CH3NH3+ (acid) and CH3NH2 (base)
HClO (acid) and CH3NH2 (base)
HClO (acid) and ClO- (base)
CH3NH2 (acid) and ClO- (base)
CH3NH3+ (acid) and ClO- (base)
HClO (acid) and CH3NH3+ (base)

(e) CO32- + H2O equilibrium reaction arrow HCO3− + OH −
HCO3- (acid) and CO32- (base)
H2O (acid) and OH - (base)
HCO3- (acid) and OH - (base)
HCO3- (acid) and H2O (base)
OH - (acid) and CO32- (base)
H2O (acid) and CO32- (base)