# Problem: What will be the result if 100 mL of 0.06 M Mg(NO 3)2 is added to 50 mL of 0.06 M Na2C2O4? Assume the reaction is taking place at 25°C. Substance              Ksp, 25°C MgC2O4(s)           8.6 x 10 –5 A) No precipitate will form. B) A precipitate will form and an excess of Mg 2+ ions will remain in solution. C) A precipitate will form and an excess of C2O42– ions will remain in solution. D) A precipitate will form, but neither ion is present in excess.

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What will be the result if 100 mL of 0.06 M Mg(NO 3)2 is added to 50 mL of 0.06 M Na2C2O4? Assume the reaction is taking place at 25°C.

Substance              Ksp, 25°C

MgC2O4(s)           8.6 x 10 –5

A) No precipitate will form.

B) A precipitate will form and an excess of Mg 2+ ions will remain in solution.

C) A precipitate will form and an excess of C2O42– ions will remain in solution.

D) A precipitate will form, but neither ion is present in excess.

What scientific concept do you need to know in order to solve this problem?

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 Billman's class at Abilene Christian University.