The relative concentrations of CO 2 , H 2CO 3 , and the deprotonated forms HCO − 3 ( bicarbonate ) and CO2 − 3 ( carbonate ) depend on the pH. .
The relative concentrations of CO2 , H2CO3 , and the deprotonated forms HCO − 3 ( bicarbonate ) and CO2 − 3 ( carbonate ) depend on the acidity ( pH ) .