A solution of Na2C2O4 is added dropwise to a solution that is 0.0339 M in Cd2+ and 0.359 M in Ag+. The Ksp of CdC2O4 is 1.42e-08. The Ksp of Ag2C2O4 is 5.4e-12. (a) What concentration of C2O42- is necessary to begin precipitation? (Neglect volume changes.) [C2O42-] =_____  M. (b) Which cation precipitates first? ____Cd2 ____Ag+     (c) What is the concentration of C2O42- when the second cation begins to precipitate? [C2O42-] =________  M.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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A solution of Na2C2O4 is added dropwise to a solution that is 0.0339 M in Cd2+ and 0.359 M in Ag+.

The Ksp of CdC2O4 is 1.42e-08.
The Ksp of Ag2C2O4 is 5.4e-12.

(a) What concentration of C2O42- is necessary to begin precipitation? (Neglect volume changes.)

[C2O42-] =_____  M.

(b) Which cation precipitates first?

____Cd2
____Ag+    

(c) What is the concentration of C2O42- when the second cation begins to precipitate?

[C2O42-] =________  M.


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