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5 July, 11:36

A solution containing cacl2 is mixed with a solution of li2c2o4 to form a solution that is 3.5 * 10-4 m in calcium ion and 2.33 * 10-4 m in oxalate ion. what will happen once these solutions are mixed? ksp (cac2o4) = 2.3 * 10-9.

a. nothing will happen since both calcium chloride and lithium oxalate are soluble compounds.

b. nothing will happen ksp> q for all possible precipitants.

c. a precipitate will form as calcium oxalate is not soluble to any extent.

d. a precipitate will form since q > ksp for calcium

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  1. 5 July, 13:56
    0
    The correct answer is (d)

    when Ksp = [Ca2+][Ca2O4-2] = 2.3 x 10^-9

    So, we need to get the value of q to compare it with Ksp:

    q = [Ca2+][Ca2O4-2]

    when we have [Ca2+] = (3.5 x 10^-4)

    and [Ca2O4-2] = (2.33 x 10^-4)

    by substitution:

    q = (3.5 x 10^-4) * (2.33 x 10^-4)

    = 8.155 x 10^-8

    we can see that q > Ksp

    ∴ the correct answer is (D) a precipitate will form since q > Ksp for calcium
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