Solid sodium sulfate is slowly added to 150 mL of a 0.0549 M calcium nitrate solution. The concentration of sulfate ion required to just initiate precipitation is
Ksp of CaSO4 = 2.4 x 10-5
CaSO4 (s) --------------> Ca2+ (aq) + SO42- (aq)
0.0549 x
Ksp = [Ca2+][SO42-]
2.4 x 10^-5 = 0.0549 x [SO42-]
[SO42-] = 4.37 x 10^-4 M
concentration of sulfate ion = 4.37 x 10^-4 M
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