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14 November, 19:20

Which of the following aqueous solutions are good buffer systems?. 0.32 M calcium chloride + 0.27 M sodium chloride 0.35 M ammonia + 0.36 M calcium hydroxide 0.19 M barium hydroxide + 0.28 M barium chloride 0.12 M hydrofluoric acid + 0.17 M potassium fluoride 0.20 M hydrobromic acid + 0.22 M sodium bromide

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  1. 14 November, 19:50
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    0.12 M hydrofluoric acid + 0.17 M potassium fluoride

    Explanation:

    To make a buffer, you must to have an aqueous mixture of a weak acid and its conjugate base or vice versa.

    Knowing that:

    0.32 M calcium chloride + 0.27 M sodium chloride: is not a good buffer system because CaCl₂ and NaCl are both salts.

    0.35 M ammonia + 0.36 M calcium hydroxide is not a good buffer system because ammonia is a weak base but calcium hydroxide is a strong base

    0.19 M barium hydroxide + 0.28 M barium chloride is not a good buffer system because Ba (OH) ₂ is a strong base.

    0.12 M hydrofluoric acid + 0.17 M potassium fluoride is a good buffer system because HF is a weak acid and KF (F⁻ in aqueous medium), is its conjugate base

    0.20 M hydrobromic acid + 0.22 M sodium bromide is not a good buffer system because HBr is a strong acid.
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