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Unformatted text preview: and CoS as solids. (e) Aqua regia is used because it will dissolve the ZnS and leave the NiS and CoS as solids. 17. [7 points] A solution contains 0.015 M Al 3+ and 0.015 M Ag + . Solid Na 3 PO 4 is slowly added to separate the two cations. The K sp for AlPO 4 is 9.8 x 1021 and K sp for Ag 3 PO 4 is 8.9 x 1017 . Which precipitate will form first and what concentration of PO 4 3 ion should be added to the solution to ensure the best separation? (a) AlPO 4 will form first; [PO 4 3] = 6.4 x 1019 M (b) AlPO 4 will form first; [PO 4 3] = 2.5 x 1011 M (c) Ag 3 PO 4 will form first; [PO 4 3] = 6.4 x 1019 M (d) Ag 3 PO 4 will form first; [PO 4 3] = 2.5 x 1011 M (e) a ppt will not form since solid Na 3 PO 4 is added...
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 Spring '06
 larosa
 Chemistry

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