Problem: What volume of 0.116 M sodium carbonate solution is required to precipitate 99% of the Mg from 1.00 L of 0.100 M magnesium nitrate solution?

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We're being asked to determine the volume of 0.116 M Na2CO3 needed to precipitate 99% of Mg from 1 L of 0.1 M Mg(NO)3

Writing the reaction for when solid MgCO3 breaks into ions

MgCO3 (s)  Mg2+aq) + CO32-(aq)

** Since it has a solubility product constant, we can consider MgCO3 as a solid. 

We need to find 1% Mg2+ left since 99% are already precipitated, therefore the concentration of Mg2+ is:

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What volume of 0.116 M sodium carbonate solution is required to precipitate 99% of the Mg from 1.00 L of 0.100 M magnesium nitrate solution?

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Our tutors have indicated that to solve this problem you will need to apply the Selective Precipitation concept. If you need more Selective Precipitation practice, you can also practice Selective Precipitation practice problems.

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Based on our data, we think this problem is relevant for Professor Mcintire's class at UCI.