J.R. S. answered 04/16/20
Ph.D. University Professor with 10+ years Tutoring Experience
The conjugate acid of a base is that base with the addition of a proton (H+).
a. F− ... HF
b. CN- ... HCN
c. NH3 ... NH4+
d. NO2- ... HNO2
e. OH- ... H2O
f. Cl- ... HCl
g. CH3NH2 ... CH3NH3+
h. PO32- ... HPO3-