When H2CO3 dissociates into H and HCO3- the pH of water increases to an extent but not much.
- The dissociation of H2CO3 is as follows;
H2CO3-->H+ + HCO3-
- H2CO3 is considered an acid because it ionizes in H+ and HCO3-. Some of the HCO3- will bond with water and form OH- and H2CO3 again.
- This is an equilibrium. But If we have only one HCO3- that didn't yet bond to water and formed H2CO3 again, we will have more H+ in the medium, and it will be acid.
- In fact, there is a constant called Ka that measures how much HCO3- and H2CO3 are in a solution in a given time.
- The concentration of H+ ions doesn't increase much on dissociation so pH doesn't increase much but to an extent.
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