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21 October, 22:54

A solution with a pH of 9 has a [OH-] concentration of A. 1.0 * 10-14 mol/L. B. 1.0 * 10-9 mol/L. C. 1.0 * 10-5 mol/L. D. 1.0 * 10-7 mol/L.

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  1. 21 October, 23:05
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    PH is scale which measures the acidity or alkalinity of a solution. It ranges from a level of 1 to 14. The pH level is expressed as the negative logarithm of the concentration of hydronium ions. To determine the concentration of the hydroxide ions, we use the relation that pH + pOH = 14 where pOH is equal to the negative logarithm of the concentration of the hydroxide ions. We do as follows:

    pH + pOH = 14

    pOH = 14 - pH

    pOH = 14 - 9

    pOH = 5

    5 = - log [OH-]

    [OH-] = 10^-5 M

    Therefore, the correct answer would be option C. The concentration of the hydroxide ions in a solution with pH 9 would be 1x10^-5 M.
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