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il postino

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- 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!