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28 August, 12:01

Recall that the value of Kw for the autoionization of water varies with temperature. At the temperature of your body (37°C), Kw = 3.98 x 10-14 rather than 1.00 x 10-14. What is the pH of pure water at 37°C?

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  1. 28 August, 12:11
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    pH = 6.70

    Explanation:

    When Kw = 1x10^-14

    [H3O+] = [OH-] - -> 1x10-7

    Kw = 3.98x^10-14

    3.98x^10-14 = [H3O+]. [OH-]

    √ (3.98x^10-14) = [H3O+] = [OH-]

    [H3O+] = 1.99*10^-7

    - log [H3O+] = pH - --> - log 1.99x10^-7 = 6.70
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