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Solid sodium sulfate is slowly added to 150 mL of a 0.0549 M calcium nitrate solution....

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

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Answer #1

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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