The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.

Question

Chemistry

Shane Hays

29 October, 10:05

The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.

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Answers (1)

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Brendon Shepard · Answer 1

Kw is equal to the concentration of the H + and the OH-. In pure water, the concetration of H + and the OH - is equal. In computing for the pH of water, we tke the negative log of the concentration of H+. To solve the concentration of H + we take the square root of the Kw (Since Kw=[H+]*[H+] since [H+]=[OH-])

H + is equal to 1.104*10^-7

negative log of the H + conc. or the pH is 6.96 (pH = - log (1.104*10^-7))

The answer is valid and is close to the neutral pH which is 7.