15. A 0.012-mol sample of Na2SO4 is added to 400 mL of each of two solutions. One solution contains 1.5 x 10–3?
15. A 0.012-mol sample of Na2SO4 is added to 400 mL of each of two solutions. One solution contains 1.5 x 10–3 M BaCl2; the other contains 1.5 x 10–3 M CaCl2. Given that Ksp for BaSO4 = 1.5 x 10–9 and Ksp for CaSO4 = 6.1 x 10–5:
a) BaSO4 would precipitate but CaSO4 would not.
b) CaSO4 would precipitate but BaSO4 would not.
c) Both BaSO4 and CaSO4 would precipitate.
d) Neither BaSO4 nor CaSO4 would precipitate.
e) Not enough information is given to determine if precipitation would occur.
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[SO42-] = 0.012 mol / 0.400 L = 0.0300 M
Qsp = 0.0300 x 1.5 x 10^-3 = 4.5 x 10^-5 >> Ksp BaSO4
precipitation of BaSO4 should occur
Qsp = 0.0300 x 1.5 x 10^-3 = 4.5 x 10^-5 < Ksp CaSO4
precipitation of CaSO4 should not occur