Question

How does the pH of acid change when a carbonate is added?

Answer 1

Carbonates will (partly) neutralize the acid, so `pH` goes up.

Explanation:

This is due to the reaction:

`2H_3O^+(aq) +CO_3^(2-)(aq) ->3H_2O(l)+CO_2(g)`

or: `2H^+(aq) +CO_3^(2-)(aq) ->H_2O(l)+CO_2(g)`