I have a formula of potassium carbonate and water, saturated solution. How can I change the pH from 12 to 8?

i think if u add some SO2 it will become more acidicI have a formula of potassium carbonate and water, saturated solution. How can I change the pH from 12 to 8?
Add water.

WAter has a ph of 7, so adding water will lower the ph of the solution.

Alternatively, adding any alkali or any substance with a ph lower then 8 will do the trick.