Question

. A solution contains one or more of the following ions: Hg2 2+, Ba2+, and Fe2+ . The cations that are present are balanced by an equivalent amount of NO3 − . The following tests are done to help identify the cations present: a) When potassium chloride is added to the solution, a precipitate forms, which is then filtered off. b) To the remaining solution, potassium sulfate is added, producing no precipitate. c) When potassium carbonate is added to the remaining solution, a precipitate occurs. Which ions are present in the original solution ? For credit, provide a complete explanation for the ion(s) you selected as present. Write a balanced molecular equation for the formation of each of the precipitates observed.