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## Homework Statement

What is the maximum [Ca2+] that can exist with 5.2e-4 M c2O4 2- without precipitating? Ksp for CaC2O4 = 2.6e-9.

## Homework Equations

Well, the Ksp and M is given, I don't know how to apply them.

## The Attempt at a Solution

I need help because I missed the lesson.

Thank you.

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