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5 December, 23:01

What is the concentration of hydroxide ions in pure water at 30.0c, if kw at this temperature is 1.47 x 10-14?

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  1. 6 December, 02:02
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    In pure water, the concentration of hydronium ions, or H⁺, will equal the concentration of hydroxide ions. That is [H⁺] = [OH⁻].

    Remember that Kw = [H⁺][OH⁻] for water and if [H⁺] and [OH⁻] are both equal, we can easily solve for them by taking the square root of Kw.

    [H⁺] = [OH⁻] = sqrt (1.47*10^-14) = 1.21*10^-7

    The concentration of hydroxide ions at 30 degrees Celsius is 1.21*10^-7
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