Solid sodium carbonate is slowly added to a solution that has 0.150 M magnesium perchlorate and 0.150 M calcium perchlorate (assume no volume change). What solid precipitates out first? What is the concentration of calcium ion in solution when magnesium ion begins to precipitate? The Ksp for CaCO3 is 4.96 × 10-9 and Ksp for MgCO3 is 6.82 × 10-6.

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