You are given an unknown sample that when treated with hydrochloric acid forms a precipitate. After decantation, you add boiling water to the solid; some of the solid disappears You decant the solution and add a few drops of K2Cro4; a yellow solid appears. To the solid left from the addition of boiling water, you add ammonium hydroxide and centrifuge the product. You then decant the liquid and add concentrated nitric acid to the solution until acidic; a white precipitate forms. Which group 1 cations were present in your unknown?
Which group 1 cations were shown not to be present in your unknown? Which group 1 cations were not established as being present or absent in your unknown?