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Suppose there is a solution containing 0.020 M Ba2+ and 0.020 M Co2+. Which of them...

Suppose there is a solution containing 0.020 M Ba2+ and 0.020 M Co2+. Which of them is precipitated first by addition of CO32? Is it possible to lower the concentration of the first precipitated ion by 99.99% without precipitating the other? (Ksp of BaCO3 = 2.58 x10^-9 and Ksp of CoCO3 = 1.00 x10-10)

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