So this must be our base. So our seven molar concentration now refers to the concentration of hydroxide. So we simply repeat the step kw 10th to negative 14 equal it unknown times seven. We bring the seven over and we get divided. And we get 4.1.43 times ten to negative 15 molar of this guy of seven molar sodium hydroxide. So these two numbers have the same magnitude, but they mean two different things.