What is meant by conjugate acid base pair ? Explain with the help of a chemical reaction.

Explanation

Conjugate acid base pairs are the substances, which can be formed from each other by the loss or gain of proton. For example, consider the following reaction :
`HCl (aq) + NH_(3)(aq) hArr NH_(4)^(+)(aq) + Cl^(-)(aq)`
Here, HCl donates `H^(+)` ion. Therefore, it behaves as an acid. `Cl^(-)` has tendency to accept `H^(+)` ion, therefore, it behaves as conjugate base of HCl and `NH_(4)^(+)` behaves as conjugate acid of `NH_(3)`.