2. A sample solution is given to you that may contain any or all of the following ions: Ag+,Pb2+, and Ni2+. In an attempt to determine which cation(s) are present, you add the following solutions. You found that no precipitate formed when either an aqueous solution of NaCl or an aqueous solution of Na2SO4 was added to the sample solution. However, a precipitate did form when you treated the sample solution with a basic solution of NaOH. Which cation or cations are present in the sample? Give your reasoning. (Hint: see Table 4.1 of Zumdahl et al.). 3. Balance the following redox reactions. Identify the oxidizing and reducing agents, and the substances oxidized and reduced. (a) Al(s)+NO2(aq)AlO2(aq)+NH3(aq) in basic solution. (b) H2SO3(aq)+MnO4(aq)Mn2+(aq)+HSO4(aq) in acidic solution. Experimental Procedures Follow these instructions and use the lab report page (found on p. 9) to record your observations. You will be marked on your observations, unknown identifications and reaction equations. All waste solutions are to be poured in designated container in the fume hood