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26 June, 12:40

Find the Ka of nitrous acid given that a 0.20 M solution of the acid has a hydrogen ion concentration of 2.8*10-3 M. HNO2 (aq) ? H + (aq) + NO2 - (aq)

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  1. 26 June, 14:09
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    3.92 x 10⁻⁵.

    Explanation:

    ∵ [H⁺] = √ (Ka. c)

    ∴ Ka = [H⁺]²/c = (2.8 x 10⁻³) ² / (0.20) = 3.92 x 10⁻⁵.
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