A. P. Biology Practice pH Problems 1. A solution of HCl is found to have 1.0 X 10-3 M = [H+]. Calculate, pH = pOH = [OH-] = 2. A solution of NaOH is found to have 1.0 X 10-8 M = [OH+]. Calculate, pH = pOH = [H+] = 3. Which solution above, #1 or #2 has the greatest concentration of [H+]? By how much?

4. A solution has been found to have a pH = 3.0 . Calculate. pOH = [OH-] = [H+] = 5. A solution of KOH is found to have a [OH-] = 2. 5 X 10-2 M. Calculate, pH = pOH = [H+] = 6. A solution of 1.0 X 10-4 M acetic acid is found to ionize only 20%. Calculate, pH = pOH = [H+] = 7. A solution is found to have a pH = 2.3. Calculate, pOH = [H+] = [OH-] = 8. A solution is found to have a pOH = 3.5. Calculate, pH = [H+] = [OH-] =

Answers: 1.

pH = 3 pOH = 11 [OH-] = 1.0 X 10-11 M

2.

pH = 6 pOH = 8 [H+] = 1.0 X 10-6 M

3.

Solution #1 , 1,000X

4.

pOH = 11 [OH-] = 1.0 X 10-11 M [H+] = 1.0 X 10-3 M

5.

pH = 12.4 pOH = 1.6 [H+] = 4.0 X10-13 M

6.

pH = 4.69 pOH = 9.31 [H+] = 2.0 X 10-5 M

7.

pOH = 11.7 [H+] = 5.0 X 10-3 M [OH-] = 2.0 X 10-12M

8.

pH = 10.5 [H+] = 3.16 X 10-11 M [OH-] = 3.16 X 10-4 M