like all equilibrium constant Kw varies with temperatures. Kw equals 2.92 * 10^-15 at 10⁰C , 1 * 10^-14 at 25⁰C and 2.92 at 10^-14 at 40 ⁰C. In light of this information, calculate and compare the PH values for pure water at these three temperatures. Based on your calculations, is it correct to say that the PH of pure water is always 7.0? Explain your answer.​