# Checking my work on one pH (and pOH) problem.

A solution in water has 1.0x10E-5 moles of H+ ion in 10.0 liters of solution.

-What is the pH?

-What is the concentration of the OH- ion?

My notes give an example of:

3.75 x 10E-4 with the result of -3.425968732

However, when I attempt to run the example through my calculator I end up with 0.60205999...

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#### Solution Preview

Since pH = -log[H+] and you have 1x10E-5 moles in 10 L of solution,

your [H+] = (1x10E-5 moles)/10L = 1x10E-6 molar (M),

and therefore your pH = 6.0.

Since Kw = 1x10E-14 = [H+]*[OH-],

your [OH-] = (1x10E-14)/(1x10E-6) = 1x10E-8 M

We can check this since pH + pOH = 14, and the negative log of the [OH-] = 8, so it's right.

I don't know if ...

#### Solution Summary

Given a certain volume of H+ ions in solution, calculate the pH and [OH-]. The answer is fully explained.

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