Question

In the Brønsted-Lowry system, an acid reacts by donating a proton to a base. In doing so, the acid becomes its conjugate base. The formula of the conjugate base is the formula of the acid less one hydrogen. The reacting base becomes its conjugate acid. The formula of the conjugate acid is the formula of the base plus one hydrogen ion

What is conjugate acid base pair?


Identify the acid, base, conjugate acid and conjugate base for the following equations.


1) HF + H2O → F− + H3O+


2) HSO4 ­ + NH3 → SO42− + NH4+


3) C2H3O2− + HCl → HC2H3O2 + Cl−

Answer 1

Acid: HF Base: H2O Conjugate acid: H3O+ Conjugate base: F-

Acid: HSO4­ Base: NH3 Conjugate acid: NH4+ Conjugate base: SO42-

Acid: HCl Base: C2H3O2- Conjugate acid: HC2H3O2 Conjugate base: Cl-