# How do you find the pH, the pOH, [H3O+], and [OH-] in equations?

##### 1 Answer

#### Answer:

#### Explanation:

This ion product, this equilibrium, has been established by experiment at

Now, given the equation, we can manipulate it, as long as we do it to both sides of the equation. So we take

But by definitions,

And thus

Now if you are at A level, you only have to know this last result. You do have to be able to use it to solve problems. There should be many examples of problems on these boards so get cracking.