Metal Cations Lab Report

Day 2 of the experiment utilized Figure 5 to determine the metal cations present in an unknown solution #112. Each metal cation was confirmed or denied with ease, with the 2 cations present within Unknown #112 were correctly identified. Thus, Figure 5 was an accurate schematic to implement in this experiment. Following Figure 6, Unknown #112 was first added to HCl, forming a white, snow-like precipitate. The solution was decanted and separated to test the precipitate and solution, both of which possibly contained multiple cations. The precipitate formed possibly contained Ag+ and/or Pb2+. Hot DI water was added to the precipitate, forming a solution possibly containing lead (II) ions. A lack of precipitate formed denied the presence of silver ions. Then, K2CrO4 was added to the solution, forming a yellow precipitate to confirm the presence of Pb2+ ions in Unknown #112. …show more content…
First, NH3 was added to form a clear solution, possibly containing Ni2+ and/or K+ ions. Due to a lack of precipitate formation, the presence of iron (III) ions was denied. DMG was then added to the clear solution and formed a pink precipitate. The solution was centrifuged and separated to test the precipitate and clear solution separately. The pink precipitate confirmed the presence of nickel (II) ions. The clear solution underwent a flame test and did not burn a purple color. This denied the presence of K+ ions, which should have produced a purple flame. Ultimately, this confirmed the presence of Ni2+ – as well as Pb2+ – in Unknown