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7 January, 22:46

Calculate the hydroxide ion concentration, [OH-], in mol/L for each of the following materials: (a) citric acid, pH 2.20: ___ M (b) Household vinegar, pH 2.40:__M.

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  1. 7 January, 23:47
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    A. 1.585 x 10^-12 M.

    B. 2.512 x 10^-12 M.

    Explanation:

    A.

    citric acid: pH 2.20

    pH + pOH = 14

    pOH = 14 - 2.20

    = 11.80

    Remember, pOH = - log [OH]

    [OH] = 10^-pOH

    = 10^-11.8

    = 1.585 x 10^-12 M

    B.

    Household vinegar: pH 2.40

    pH + pOH = 14

    pOH = 14 - 2.40

    = 11.60

    Remember, pOH = - log [OH]

    [OH] = 10^-pOH

    = 10^-11.6

    = 2.512 x 10^-12 M
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