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21 February, 17:27

A solution with pH of 9 has [OH-] concentration of

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  1. 21 February, 18:42
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    PH = - log ([H+])

    [H+] = 10^ (-pH)

    [H+] = 10^ (-9)

    [H+][OH-] = Kw

    Kw = 1.0*10^-14 at 25 degrees celsius.

    [OH-] = Kw/[H+] = (1.0*10^-14) / (1*10^-9) = 1.0*10^-5

    The concentration of OH - ions is 1.0*10^-5 M.
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