• Perform calculations relating [H3O+], pH, [OH−], and pOH. Below are the ones that are most important in this module. o pH = –log [H3O+]
o pOH = –log [OH–]
o Kw = [H3O+][OH–] = 1× 10–14
o pKw = pH + pOH = 14.00

1. What is the pOH of a 0.0085 M KOH solution?

2. What is the [OH-] for a solution at 25°C that has pH = 4.29?

3. What is the [H3O+] for a solution at 25°C that has pOH = 5.640?

4. If the pH of a solution is determined to be 7, what would be the concentration of [H3O+]? What type of solution is it?

5. Determine the concentration of [H3O+] of the solution, given that the concentration of [OH-] = 1 x 10-8 M. What type of solution is it?

6. What is the pH of a 0.75 M HNO3 solution?

7. What is the pH of a 0.050 M LiOH solution?

8. What is the [OH-] for a solution at 25°C that has [H3O+] = 2.35 x10-3 M?