AP Chemisty

After 20.0g of Na2SO4 is added to a 0.5L saturated solution of CaSO4, does the concentration of Ca2+ increase, decrease, or stay the same? Assume that the overall volume of the solution does not change.

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  1. .......CaSO4 --> Ca^2+ + SO4^2-
    I......solid......0.......0
    C......solid......x.......x
    E......solid......x.......x

    Ksp CaSO4 = (Ca^2+)(SO4^2-)
    Now if we add a large excess of sulfate as Na2SO4, that makes SO4^2- very large, Le Chatelier's Principle says the reaction has too much sulfate so the reaction shifts to the left. That decreases (Ca^2+).

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