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:
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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