Problem: Which ions remain in solution, unreacted, after each of the following pairs of solutions is mixed?potassium carbonate and magnesium sulfate

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potassium carbonate: K2CO3 → 2 K+ + CO32-

magnesium sulfate: MgSO4 → Mg2+ + SO42-

double displacement reaction

2 K+ + SO42- → K2SO4

Mg2+ + CO32- → MgCO3

Overall reaction: K2CO3 + MgSO4 → K2SO4 + MgCO3

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Problem Details

Which ions remain in solution, unreacted, after each of the following pairs of solutions is mixed?

potassium carbonate and magnesium sulfate

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