Asked by Kristian
Write the formula of the anion present (i.e. anions are charged; do not write compounds) in these unknowns as indicated by these test results.
1) An unknown was mixed with ammonium hydroxide and then barium chloride. Nothing happened. A fresh portion was mixed with nitric acid and silver nitrate and again nothing happens. A third portion was treated with sulfuric acid and no odor was detected. Upon addition of ferrous sulfate and concentrated sulfuric acid, a purple-brown discolorization was seen.
2) An unknown was mixed with ammonium hydroxide and barium chloride. Nothing happened. A fresh portion was mixed with nitric acid and silver nitrate, whereupon a precipitate formed. A third portion was treated with chlorine water, followed by mixing with hexane. The hexane layer turned yellow, then gradually light brown upon further mixing.
Please help!!!
1) An unknown was mixed with ammonium hydroxide and then barium chloride. Nothing happened. A fresh portion was mixed with nitric acid and silver nitrate and again nothing happens. A third portion was treated with sulfuric acid and no odor was detected. Upon addition of ferrous sulfate and concentrated sulfuric acid, a purple-brown discolorization was seen.
2) An unknown was mixed with ammonium hydroxide and barium chloride. Nothing happened. A fresh portion was mixed with nitric acid and silver nitrate, whereupon a precipitate formed. A third portion was treated with chlorine water, followed by mixing with hexane. The hexane layer turned yellow, then gradually light brown upon further mixing.
Please help!!!
Answers
Answered by
DrBob222
1 nitrate ion, NO3^-
2. AgNO3 test shows either Cl^-, Br^-, or I^- present. Oxidation with Cl2 water and mixing with hexane shows either Br^- or I^-. The hexane solvent is purple if I^- so the anion must be Br^-.
2. AgNO3 test shows either Cl^-, Br^-, or I^- present. Oxidation with Cl2 water and mixing with hexane shows either Br^- or I^-. The hexane solvent is purple if I^- so the anion must be Br^-.