# What is the difference between carbonate and bicarbonate?

$H C {O}_{3}^{-}$ versus $C {O}_{3}^{2 -} \text{ bicarbonate versus carbonate.}$
The $\text{bi}$ prefix generally means the addition of ${H}^{+}$. Bisulfate $H S {O}_{4}^{-}$, bisulfite, $H S {O}_{3}^{-}$, biphosphate, $H P {O}_{4}^{2 -}$.