And when we know that poh and we want to find the PH. So to go from this guy to this guy, let's first look at a few things. Let's review. One of the logs of log states that log of X times Y equals log x plus log y. The second part I want to look at is the formulas for PH and poh. PH is equal to negative log of the hydronium concentration, and Poh is equal to the negative log of the hydroxide concentration.