A basic solution contains the iodide and phosphate ions that are to be separated via selective precipitation. The I– concentration, which is 8.60×10-5 M, is 10,000 times less than that of the PO43– ion at 0.860 M . A solution containing the silver(I) ion is slowly added. Ksp of AgI is 8.30×10-17 and of Ag3PO4, 8.90×10-17. (a) Calculate the minimum Ag+ concentration required to cause precipitation of AgI. (b) Calculate the minimum Ag+ concentration required to cause precipitation of Ag3PO4. (c) Is the separation of the I– and PO43– ion complete (is the percentage of "remaining" ion less than 0.10% or its original value)?

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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A basic solution contains the iodide and phosphate ions that are to be separated via selective precipitation. The I concentration, which is 8.60×10-5 M, is 10,000 times less than that of the PO43– ion at 0.860 . A solution containing the silver(I) ion is slowly added. Ksp of AgI is 8.30×10-17 and of Ag3PO4, 8.90×10-17. (a) Calculate the minimum Ag+ concentration required to cause precipitation of AgI. (b) Calculate the minimum Ag+ concentration required to cause precipitation of Ag3PO4. (c) Is the separation of the I and PO43– ion complete (is the percentage of "remaining" ion less than 0.10% or its original value)?

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