How to Calculate pH of a 0.15 M Solution of Potassium Hydroxide Using Kw Value

[D.J Falcon]

Homework Statement

A strong base cane be assumed to be fully ionised in dilute solution. Use the Kw value to calculate the hydrogen ion concentration and hence the pH of a 0.15 M solution of potassium hydroxide, KOH.

Homework Equations

The Attempt at a Solution

Problem is, I don't know where to begin, so any advice on how to proceed or pointers would be appreciated.

 

[D.J Falcon]

Yeah, I think I managed to do it meself. Forgot it was a strong base.

pOH=-log10[OH-]
pOH=-log10[0.15M]
pOH=0.824

pH+pOH=14 ∴ pH=14-0.824=13.176

 

[Borek]

Too many digits - 13.18 would be more to my liking. Other than that you did OK.