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26 March, 07:25

Which expression represents the concentration of OH - ions in solution? a. [OH-]  10-14 b. 10-14  [H3O+] c. 10-14  [H3O+] d. 10-14 - [H3O+]

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  1. 26 March, 07:51
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    10^-14 / [H3O+]

    Explanation:

    Hydronium (H3O+) and hydroxide ions (OH-) are both present in pure water and in all aqueous solutions.

    Their respective concentrations in water are 10^-7 M each and are inversely proportional to each other as given by the ion product of water, Kw.

    Kw = [H3O+][OH-]

    Where Kw = 1.0 * 10^-14,

    [H3O+] = concentration of hydronium ions

    [OH-] = concentration of hydroxide ions

    Therefore, [OH-] = Kw / [H3O+]

    [OH-] = 10^-14/[H3O+]
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