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25 February, 22:28

Which best describes what happens when 50 mL of 0.0010M CaCl2 is added to 50 mL of 0.010M Na2SO4? (The Ksp of CaSO4 = 2.4 * 10-5.)

The solution will be at equilibrium.

CaSO4 will precipitate out of solution

No precipitation will occur.

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  1. 25 February, 23:26
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    When the solutions are diluted in half:

    So [ Ca+2] = 0.001/2 = 0.0005 M

    [SO4-2] = 0.01/2 = 0.005

    when Q = [Ca2+][SO4-2]

    so by substitution:

    Q = 0.0005*0.005 = 2.5x10^-6

    by comparing with Ksp value

    So when Q < Ksp

    ∴ the answer is no precipitation will occur, as the solution is unsaturated.
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