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8 December, 14:08

Rank the following 0.100 M solutions in order of increasing H3O + concentration:

HF, Ka = 6.3 * 10-4; HCN, Ka = 6.2 * 10-10; HOCl, Ka = 4.0 * 10-8

HF < HCN < HOCl

HCN < HOCl < HF

HOCl < HCN < HF

HF < HOCl < HCN

HOCl < HF < HCN

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Answers (1)
  1. 8 December, 17:50
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    HCN < HOCl < HF

    Explanation:

    The larger the Kₐ value, the stronger the acid.

    6.2 * 10⁻¹⁰ < 4.0 * 10⁻⁸ < 6.3 * 10⁻⁴

    HCN < HOCl < HF

    weakest stronger strongest
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