And now I simply apply the formula for poh. So, Poh is equal to 10.5,
which is equal to negative log of the concentration of oh. Now, I convert this log to exponents. By first bringing the negative sign to this side, I see that my base is ten. And I raise that base ten to the negative 10.5 exponent. So, my concentration of hydroxide is equal to ten to the negative 10.5.