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A solution of NaSCN is added dropwise to a solution that is 0.0821 M in Hg22+...

A solution of NaSCN is added dropwise to a solution that is 0.0821 M in Hg22+ and 0.0142 M in Cu+. The Ksp of Hg2(SCN)2 is 3.2e-20. The Ksp of CuSCN is 1.77e-13.

(a) What concentration of SCN- is necessary to begin precipitation? (Neglect volume changes.)

(b) Which cation precipitates first? Hg2 2+ or Cu+

(c) What is the concentration of SCN- when the second cation begins to precipitate?

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