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Thread: Hellppp

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    Hellppp

    Sorry if this is a dumb question but how would this be solved:

    "Calculate the hydroxide ion concentration of a solution of potassium hydroxide with a pH of 9"

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    Re: Hellppp

    KOH --> K + OH

    pH+pOH = 14
    pOH = 14 - pH
    = 14 - 9
    = 5

    [OH-] = 10^-pOH
    = 10^-5
    = 0.00001M
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    Re: Hellppp

    Yeah or an easier way is
    10^-9 = [hydronium concentration]
    1 x 10^-14 = [h3O+] x [OH-]
    1 x 10^-14 / 10^-9
    Thus 0.00001M = OH-

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