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Ksp and common ion question

  • #1

Homework Statement


Is it possible to precipitate 99.0% of 0.010 M Ce3+ by adding oxalate (C2O42-) without precipitating 0.010 M Ca2+
CaC2O4 Ksp = 1.3 x 10-8 Ce2(C2O4)3 Ksp = 5.9 x 10-30

Homework Equations


1.3x10-8 = [0.01M][C2O4-]
5.9x10-30=[0.01M]2[C2O4]3

The Attempt at a Solution


All Ive been able to do is set up those Ksp equations but I'm not sure what to do from here
 

Answers and Replies

  • #2
Borek
Mentor
28,448
2,843
What is the concentration of Ce3+ after 99% has been removed?
 
  • #3
What is the concentration of Ce3+ after 99% has been removed?
1x10-4M presumably considering no volume is given to convert molarity to moles and mass
 
  • #4
Borek
Mentor
28,448
2,843
Does this number help in solving the problem further?
 

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