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27 February, 10:00

Compare the conjugate bases of these three acids. Acid 1: hypochlorous acid, HClO Acid 2: phosphoric acid, H3PO4 Acid 3: hydrogen sulfide, HS - What is the formula for the weakest conjugate base?

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  1. 27 February, 11:37
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    The weakest conjugate is HClO-.

    Explanation:

    As a general rule, the stronger the Bronsted-Lowry acid, the weaker its conjugate base, and vice versa.

    Acid 1: HClO is a strong acid, hence its conjugate base would be weak

    Acid 2: H3PO4 is a weak acid, hence its conjugate base would be strong

    Acid 3: hydrogen sulphide is also a moderately weak acid with a moderately strong conjugate base.

    In order of increasing strengths:

    HClO < H2S < H3PO4
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