Class notes
Class notes
Class notes
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1. Mixtures of metal ions in aqueous solution are often separated by<br />
5jÿ -ÿ j,qY(0- ÿ q-2 ff)ÿ ÿLfiÿ - ÿelective precipitate precipitation, with only that one is, or a by few using ofthe a reagent metal ions whose in the anion mixture. forms For a<br />
@(ÿ, 3"5g t0-z H- ÿ ×)SL example, suppose we have a solution containing both Ba+2and ag+'.<br />
"- X ÿ ÿ, 3 "5 )ÿ I oÿz)'2-- ions. If NaCI is added to the solution, AgC1 precipitates as a white<br />
[9b °z4ÿ ÿ X - iÿ ?:x ÿs- solid, but since BaC12 is soluble, the Ba+2 remains in solution.<br />
2. Example: A solution contains 1.0 X 10.4 M Cu+ and 2.0 X 10-3 M Pb+2.<br />
If a source of 1-is added gradually to this solution, will PbI2 (Ksp= ÿ I.<br />
3"b/t 0=<br />
x l0-8 ) or CuI (Ksp = 5.3 X 10-12) precipitate first? Specify the<br />
concentration of I- necessary to begin precipitation of each salt.
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