(i) Ammonium chloride (NH4Cl)
[Base NH4OH (ammonium hydroxide)
Acid HCl (hydrochloric acid)]
(ii) Sodium carbonate (Na2CO3)
[Base NaOH (sodium hydroxide)
Acid H2CO3 (carbonic acid)]
(iii) Sodium chloride (NaCl)
[Base NaOH (sodium hydroxide)
Acid HCl (hydrochloric acid)]