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17 June, 16:08

If A is slowly added to a solution containing 0.0500 M of B and 0.0500 M of C, which solid will precipitate first? The solubility product constant for A2B3 is 2.30*10-8. The solubility product constant for AC4 is 4.10*10-8.

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  1. 17 June, 16:13
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    AC₄ will precipitate out first.

    Explanation:

    A solid will precipitate out if the ionic product of the solution exceeds the solubility product.

    Let us check the ionic product

    a) A₂B₃

    Ionic product = [A]²[B]³

    [A] = say "s"

    [B] = 0.05, [B]³ = (0.05) ³ = 0.000125

    2.3 X 10⁻⁸ = [A]² (0.000125)

    [A] = 0.0136

    b) AC₄

    Ionic product = [A] [C]⁴

    [A] = "s"

    [A][0.05]⁴ = 4.10 X 10⁻⁸

    [A]=0.00656 M

    So for ionic product to exceed solubility product, we need less concentration of A in case of AC₄.
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