Al and Blue Solution Lab
In the Al and Blue Solution lab, we put aluminum foil in an unknown blue liquid. The next class period, we saw that the liquid turned clear and that there was red rusty looking metal formed at the bottom. We then conducted experiments to figure out the products and reactants in the chemical reaction. After observing the aluminum deteriorating, we believed that it dissolved into the water. After testing that there was aluminum foil in the solution, it was confirmed that there was aluminum in it when a precipitate formed when combining the solution with ammonium. The second observation we made was the red solid formed at the bottom which we thought was copper. Our guess was confirmed when we tested for it and the flame turned greenish after putting the copper into the flame. To be sure the solid was copper, we took another sample, smearing it over a petri dish. We then added nitric acid and saw a brown gas form and our solution turned blue proving that copper is present in the solution. Next, we tested our original blue solution to determine if any copper was present in the liquid. We added household ammonia to the solution and because it turned into a deep cobalt blue, we concluded that there was copper in the blue solution. Our last and final experiment involved testing if there was any anions in either solution. We used the blue solution with silver nitrate and observed a white precipitate we concluded that there were anions in the solution. Through observations and experiments, we concluded that the original blue solution was copper chloride and when mixed with aluminum the copper was replaced by aluminum creating aluminum chloride and the remaining red moss at the bottom was copper. ...
Please join StudyMode to read the full document