A solution of Ca(NO3)2 is mixed with a solution of Li2C2O4 to form a solution th

Question

A solution of Ca(NO3)2 is mixed with a solution of Li2C2O4 to form a solution that is 2.1x10-5 M in Ca2+ and 4.75x10-5 M in C2O42- at 25°C. Which of the following statements is correct concerning the state of the solution upon mixing? The Ksp of CaC2O4 (calcium oxalate) at 25°C is 2.3x10-9.

A precipitate will form since Q > Ksp for calcium oxalate

Nothing will happen since both calcium nitrate and lithium oxalate are

soluble compounds

Nothing will happen since calcium oxalate is extremely soluble

Nothing will happen since Ksp > Q for the possible precipitate

A precipitate will form since the mixture is at equilibrium, with Ksp = Q

Explanation / Answer

Ksp =

Ksp = [Ca+2][C2O42-] = 2.3*10-9

Q = [Ca+2][C2O42-]

   = 2.1*10-5 *4.75*10-5 = 9.975*10-10

Ksp> Q

Nothing will happen since Ksp > Q for the possible precipitate

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