Here is a similar problem.
http://www.jiskha.com/display.cgi?id=1268100336
Calculate the pOH and pH at 298K of solutions having the following ion concentrations
A.[OH-] = 1.0 X 10^-12
B.[OH-] = 1.3 X 10^-2
2 answers
how to calculat the H3O+and oH-concentrations of 0.05M sodium hydroxide