The hydroxide ion concentration in an aqueous solution at 25

The hydroxide ion concentration in an aqueous solution at 25°C is 2.7×10^-2 M.

The hydronium ion concentration is_____________M.

The pH of this solution is _______________

The pOH is _______________

Solution

POH = - log[OH -] = -log[2.7*10^-2M]

= 1.568

PH + POH =14

Ph =14 - POH

=14- 1.568

PH =12.431

PH = -log[H3O+]

[H3O+] = antilog (-PH)

= antilog (-12.413)

=3.863*10^-13M