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1)A solution has a [OH-] of 5.2 x 10-4. What is the [H3O+] in the solution?

2) A 0.25 M solution of a monoprotic acid, HA, has a pH of 2.54. What is Ka for this acid?
The dissociation of HA is: HA + H2O <--> H3O+ + A-
(Hint: write the expression for pH)

3 A solution has a pH of 11.95. What is the [OH-] in the solution?

4) Calculate the pH of a 0.0054 M KOH solution.

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