Problem: A solution contains one or more of the following ions: Ag+, Ca2+, and Cu2+. When sodium chloride is added to the solution, no precipitate forms. When sodium sulfate is added to the solution, a white precipitate forms. The precipitate is filtered off and sodium carbonate is added to the remaining solution, producing a precipitate.Write net ionic equations for the formation of each of the precipitates observed.

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Addition of sodium sulfate (Na2SO4)

Sulfides (S2-) are insoluble except when with Group 1A ions (Li+, Na+, K+, etc.) and ammonium ion (NH4+) and Ca2+, Sr2+, Ba2+

Na2SO4(aq) + 2 Ag+(aq) →  Ag2SO4(s) + 2 Na+(aq) 

 Ag2SO4(aq) → insoluble

Na2SO4(aq) + Ca2+(aq) → CaSO4(s) + 2 Na+(aq) 

CaSO4(s) → soluble

Na2SO4(aq) + Cu2+ → CuSO4(s) + 2 Na+(aq) 

CuSO4(s) → insoluble


Addition of sodium carbonate (Na2CO3):

Carbonates (CO32-) are insoluble except when with Group 1A ions (Li+, Na+, K+, etc.) and ammonium ion (NH4+)

Na2CO3(aq) + Ca2+(aq) → CaCO3(s) + 2 Na+(aq) 

CaCO3(s) → insoluble


Net ionic equations:

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Problem Details

A solution contains one or more of the following ions: Ag+, Ca2+, and Cu2+. When sodium chloride is added to the solution, no precipitate forms. When sodium sulfate is added to the solution, a white precipitate forms. The precipitate is filtered off and sodium carbonate is added to the remaining solution, producing a precipitate.

Write net ionic equations for the formation of each of the precipitates observed.

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