You are given a solution and asked to analyze it for the cations Ag+, Ca2+, and...

You are given a solution and asked to analyze it for the cations Ag+, Ca2+, and Zn2+. You add HCl and a white precipitate forms. You filter out the solid and add H2SO4, and nothing appears to happen. You then add hydrogen sulfide (H2S), and a black precipitate forms. Which ions should you report as being present in your solution?

Expert Solution

Adding HCl adds chloride to the solution. According to the solubility rules, AgCl is insoluble; CaCl2 and ZnCl2 are both soluble. Since a precipitate formed, Ag+ was present.

The precipitate was filtered out, so the silver ion has been removed from the solution. Ca2+ and Zn2+ may still be present in the solution. Sulfuric acid was then added to the solution, which adds sulfate to the solution. CaSO4 is insoluble; ZnSO4 is soluble. Since nothing appears to happen, Ca2+ was not present.

The calcium sulfate precipitate was filtered out, so now both the Ag+ and Ca2+ have been removed. The solution may still contain Zn2+. Hydrogen sulfide is added to the solution. ZnS is insoluble, a black precipitate forms, indicating that Zn2+ was present.

queen_honey_blossom answered 1 year ago

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