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17 July, 17:10

At a certain temperature, the ph of a neutral solution is 7.43. what is the value of kw at that temperature? express your answer numerically using two significant figures.

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  1. 17 July, 19:12
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    The formula for Kw is:

    Kw = [H]*[OH]

    where [H] and [OH] are concentrations

    We are given the pH so we can calculate the [H] concentration from the formula:

    pH=-log[H]

    7.43 = - log[H]

    [H] = 3.715x10^-8 M

    In neutral solution, [H] = [OH], therefore:

    [OH] = 3.715x10^-8 M

    Calculating Kw:

    Kw = (3.715x10^-8) * (3.715x10^-8)

    Kw = 1.38 x 10^-15
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