Question

4. You have read that “Mountain Dew” has carbonic acid (Ka= 4.2 * 10 -7), if the solution is made by dissolving enough carbon dioxide so there is 5.0 grams of carbonic acid per 1.0 liter of solution what is the expected pH of the pop? (again find the concentration and then it’s a regular Ka problem solving for pH)

Answer 1

5/44 x 1 = 0.1136 M.

Ka=X^2/Cm.

X= 0.0002 M.

pH= 3.69.