What do you understand by conjugate pairs of acid and base? Sort out the conjugate pairs in the following reactions.
` H_2O (l)+ CO_3^(2-) (aq) hArr HCO_3^(-) (aq) + OH^(-) (aq)`

Explanation

To understand conjugate pairs of acids and bases, we first need to define what a conjugate acid and a conjugate base are.

### Definition:
1. **Conjugate Acid**: A conjugate acid is a species that is formed when a base accepts a proton (H⁺). It has one more hydrogen ion than the base.
2. **Conjugate Base**: A conjugate base is a species that is formed when an acid donates a proton. It has one less hydrogen ion than the acid.

### Given Reaction:
The reaction provided is:
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