Conjugate Acid-Base pair

Pair of acid and base that differ by a proton.

Examples:
1. OH^- and O^-^2 # 2. HCO~^3^- and CO~^3^2^-

How to find conjugate base pair:

To form an base, the substance should loose a H⁺ ion (proton). So, remove one H⁺ and subtract 1 from the charge.

To form an acid, the substance should recieve a proton. So add an H⁺ ion.