Finding pH after mixing two solutions with different H ion concentrations

[Neb0]

Homework Statement

We have a solution of 1oo ml and the concentration of H ion is 3x1o^-2 M.
We have another solution of 100 ml and the H ion concentration is 10^-12 M.

After mixing the solutions,what would be the pH of the final solution?

Homework Equations

The Attempt at a Solution

Actually I don't know how to start.

 

[Borek]

What is a neutralization reaction?

 

[cep]

Think about the definition of pH.