A solution of Na3AsO4 is added dropwise to a solution that is 0.0576 M in Cu2+ and 0.000398 M in Ag+. The Ksp of Cu3(AsO4)2 is 7.95e-36. The Ksp of Ag3AsO4 is 1.03e-22. (a) What concentration of AsO43- is necessary to begin precipitation? (Neglect volume changes.) [AsO43-] = ______M. (b) Which cation precipitates first? Cu2+ Ag+     (c) What is the concentration of AsO43- when the second cation begins to precipitate? [AsO43-] = _____M.

Fundamentals Of Analytical Chemistry
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Chapter11: Solving Equilibrium Problems For Complex Systems
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Problem 11.16QAP
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A solution of Na3AsO4 is added dropwise to a solution that is 0.0576 M in Cu2+ and 0.000398 M in Ag+.

The Ksp of Cu3(AsO4)2 is 7.95e-36.
The Ksp of Ag3AsO4 is 1.03e-22.




(a) What concentration of AsO43- is necessary to begin precipitation? (Neglect volume changes.)

[AsO43-] = ______M.



(b) Which cation precipitates first?

Cu2+
Ag+    






(c) What is the concentration of AsO43- when the second cation begins to precipitate?

[AsO43-] = _____M.

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