pH and pOH conversion square

To determine the pH of a solution or the pOH of a solution, we need to know the (H+) concentration or the (OH-) concentration. Using these we can calculate the pH, pOH, and the H+ if given the OH-, and the OH- if given the H+.

Here is the square that we use to go from one concentration to another.

http://www.fullerchemistry.com/Acid-Base%20Chemistry/acid.htm