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24 March, 07:45

The compound trimethylamine, (CH3) 3N, is a weak base when dissolved in water. Write the Kb expression for the weak base equilibrium that occurs in an aqueous solution of trimethylamine: Kb

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  1. 24 March, 08:11
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    Kb = [OH⁻]. [C₃H₉NH⁺] / [ C₃H₉N ]

    Explanation:

    The equation for the reaction of trimethylamine when it is dissolved in water is:

    C₃H₉N + H₂O ⇄ C₃H₉NH⁺ + OH⁻ Kb

    1 mol of trimethylamine catches a proton from the water in order to produce trimethylamonium.

    It is a base, because it give OH⁻ to the medium

    Expression for Kb (Molar concentration)

    Kb = [OH⁻]. [C₃H₉NH⁺] / [ C₃H₉N ]
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