When water reacts with carbon dioxide in air or soil it forms what kind of acid?

Jun 9, 2016

It forms carbonic acid ${H}_{2} C {O}_{3}$

Explanation:

$C {O}_{2} + {H}_{2} O r i g h t \le f t h a r p \infty n s 2 {H}^{+} + C {O}_{3}^{2 -}$

Or, to be more precise:
$C {O}_{2} + 3 {H}_{2} O r i g h t \le f t h a r p \infty n s 2 {H}_{3} {O}^{+} + C {O}_{3}^{2 -}$

The double arrow means that there is an equilibrium between the carbon dioxide and the acid.