# Which ion is the conjugate base of H_3PO_4?

Dec 15, 2016

dihydrogen phosphate, ${H}_{2} P {O}_{4}^{2 -}$

#### Explanation:

To find the conjugate base of any acid, simply remove one ${H}^{+}$ ion from the formula of the base, and presto!

Conversely, to find the conjugate acid of any base, add ${H}^{+}$ to the formula of that base.