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14 June, 10:51

Which insoluble compound in each pair should be more soluble in nitric acid than in pure water?

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  1. 14 June, 12:29
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    PbS or lead sulfide show less solubility in water and insoluble in nitric acid.

    Explanation:

    PbS dissociates in water. The reaction is -

    PbS (s) ⇄Pb²⁺ (aq) + S²⁻ (aq)

    The sulfide ion which is produced in the reaction is a strong comjugated base that contain weak acid like Hydrogen sulfide. The above reaction of S²⁻ with strong acid like nitric acid decrease the concentration of sulfide ion and results in equilibrium reacion that shifts the equation to right side and thus increases the solubility.

    S²⁻ (Aq) + HNO₃ (Aq) ⇄ HS (Aq) + NO₃ (Aq)
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