A solution of NaSCN is added dropwise to a solution that is 0.0707 M in Hg₂2+ and 0.0132 M in Cu*. (a) What concentration of SCN is necessary to begin precipitation? (Neglect volume changes.) [SCN"] (b) Which cation precipitates first? O H92² O Cut M. 2+ [SCN] = The Ksp of Hg₂(SCN)₂ is 3.2e-20. The Ksp of CuSCN is 1.77e-13. (c) What is the concentration of SCN when the second cation begins to precipitate? M.
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![A solution of NaSCN is added dropwise to a solution that is 0.0707 M in Hg₂2+ and 0.0132 M in Cut.
(a) What concentration of SCN is necessary to begin precipitation? (Neglect volume changes.)
[SCN"] =
M.
(b) Which cation precipitates first?
2+
O Hg₂²+
O Cu+
[SCN"] =
The Ksp of Hg₂ (SCN)2 is 3.2e-20.
The Ksp of CuSCN is 1.77e-13.
(c) What is the concentration of SCN when the second cation begins to precipitate?
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