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18 January, 09:19

What is [h3o ] in a solution of 0.075 m hno2 and 0.030 m nano2?

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  1. 18 January, 11:08
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    Answer is: concentration of hydrogenium ions is 9,54·10⁻⁵ M.

    c (HNO₂) = 0,075 M.

    c (NaNO₂) = 0,035 M.

    Ka (HNO₂) = 4,5·10⁻⁵.

    This is buffer solution, so use Henderson-Hasselbalch equation:

    pH = pKa + log (c (NaNO₂) : c (HNO₂)).

    pH = - log (4,5·10⁻⁵) + log (0,035 M : 0,075 M).

    pH = 4,35 - 0,33.

    pH = 4,02.

    [H ₃O⁺] = 10∧ (-4,02).

    [H ₃O⁺] = 0,0000954 M = 9,54·10⁻⁵ M.
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