Calculate the solubility (common ion) buffered

[il postino]

Homework Statement

Calculate the solubility of CaC2O4 in a 0.001M solution of Na2C2O4 buffered to pH equal to 4

Relevant Equations

Kps=(Ca+2).(C2O4-2)

Data:
$pK_{ps} , pKa_{1} , pKa_{2}$

Could you guide me to start solving?
Thank you!

 

[Borek]

Hint: only concentration of (COO^-)₂ counts.

 

[Mayhem]

First, set up and ICE table for the chemical equation of $\mathrm{CaC_2O_4}$ and think about what the initial concentration of the relevant dissociated ion is.

 

[Borek]

set up and ICE table for the chemical equation of $\mathrm{CaC_2O_4}$

Taking into account I is zero I don't think that will help much.

 

[epenguin]

Hint: only concentration of (COO^-)₂ counts.

Which is in your Relevant Equation. So can start. Wonder what's taking?

 

[Mayhem]

Taking into account I is zero I don't think that will help much.

Taking into account I is zero I don't think that will help much.

Yes. My mistake. My brain completely skipped over important parts of the question.