So we solve for that and we see that this is also equal to 1.0 times ten to negative seven. So we see that if the PH is equal to seven and we're at room temperature, then the concentration of the hydroxide ion is equal to the concentration of the hydrogen ion. And at this particular moment in time the solution is said to be neutral because the two concentrations are equal. And by the way, this 1.10 times ten to negative 14 value is equal to K with the W subscript. So this is equal to K with the W subscript where the W stands for water. And this particular value works at room temperature.