That means, since we know this guy and this guy, we can find the concentration of hydroxide. And we can do it by simply dividing through by 1.0
times ten negative seven. And we get x equals 1.0 times ten to negative seven. So at a PH of seven, our concentration of hydronium equals that of hydroxide. Now, at any given temperature, the ionization constant will always remain the same. So at 25 degrees Celsius, this guy will always be 1.0
times ten to negative 14.