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14 September, 06:33

Ammonia is a weak base. if the initial concentration of ammonia is 0.150 m and the equilibrium concentration of hydroxide is 0.0016m, calculate kb for ammonia.

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  1. 14 September, 07:30
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    Answer is: Kb for ammonia is 1.73·10⁻⁵.

    Chemical reaction of ammonia in water: NH ₃ + H₂O → NH₄⁺ + OH⁻.

    Kb (NH ₃) = ?.

    c ₀ (NH₃) = 0.150 M.

    c (NH ₄⁺) = c (OH⁻) = 0.0016 M.

    c (NH ₃) = 0.150 M - 0.0016.

    c (NH₃) = 0.1484 M.

    Kb (NH₃) = c (NH₄⁺) · c (OH⁻) / c (NH₃).

    Kb (NH₃) = (0.0016 M) ² / 0.1484 M.

    Kb (NH₃) = 1.73·10⁻⁵.
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