Question

If the pH of a solution is decreased from 9 to 8 which of the following has occurred? Click all that apply

1. concentration ofH+ has decreased 10-fold (10x) from what it was at pH 9
2. The concentration of H+ has increased 10-fold (10x) from what it was at pH. 9

3. The concentration of OH- has decreased 10-fold (10x) from what it was at ph 9

4. The concentration of OH- has increased 10-fold (10x) From what it was at PH 9

5. The ph has become more acidic

6. the pH has become more basic

Answer 1

Answer
2. The concentration of H+ has increased 10x from what it was at pH 9
3. The concentration of OH- has decreased from what it was at pH 9
5. The pH becomes more acidic
Explanation:
pH 7 is considered to be neutral and as we go down the pH scale the acidity increases ( pH 1 will be more acidic than ph 5 ) and we go up the pH scale basicity increases ( pH 9 will be more basic than pH 8 ) and we know that more the concentration of OH- ions more basic is the solution and more the concentration of H+ more acidic is the solution.
Therefore, on adding more H+ to the solution pH decreases to make the solution less basic and more acidic.