a solution contains one or more of the following ions: a g , c a 2 , and c u 2 . when sodium chloride is added to the solution, no precipitate occurs. when sodium sulfate is added to the solution, a white precipitate occurs. the precipitate is filtered off and sodium carbonate is added to the remaining solution, producing a precipitate. which ions were present in the original solution? write net ionic equations for the formation of each of the precipitates observed.
