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25 April, 03:56

Determine the pOH of a solution with the following 8.3*10^-7 M and classify the solution as acidic basic or neutral

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  1. 25 April, 04:12
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    One information is missing: the variable whose concentration is 8.3 * 10^-7 M.

    There are two reasonable possibilities: 1) it is [H+] = [H3O+], or 2) it is [OH-]

    So, I will do the problem with the two possibilities:

    1) [H+] = [H3O+] = 8.3 * 10 ^ - 7 M

    => pH = log { 1 / [H+] } = log { 1 / (8.3 * 10^-7) } = 6.08

    => pOH = 14 - 6.08 = 7.92

    And the solution is acidic (pH acid)

    2) [OH-] = 8.3 * 10^ - 7

    => pOH = log { 1 / [OH-] } = log { 1 / (8.3 * 10 ^ - 7) } = 6.08

    => pH = 14 - 6.08 = 7.92

    => The solution is basic (pH > 7 = > basic)
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