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13 August, 11:12

What is the hydrogen concentration of a solution with a pH of 2.1?

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  1. 13 August, 11:42
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    8*10^ (-3) mol/L

    Explanation:

    The formula for finding the hydrogen ion concentration is ...

    [H⁺] = 10^-ph

    [H⁺] = 10^ (-2.1)

    [H⁺] = 0.00794 ... mol/L = 8*10^ (-3) mol/L

    The answer is to 1 significant digit because the pH has one decimal place.
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