The Chemistry and Qualitative Analysis of Cations: Group Separations and Separation of Group 1 Cations. Part II and III- known and unknown. Joan Cebada section 22466 Partner’s name: Jenny Leung Instructor: Juliet Baidoo Date of experiment: 10/21/2019
Purpose The purpose of this experiment is to separate the cations of groups II and III observe the chemical changes that occur. The qualitative chemical reactions that occur will indicate the presence of Ag+, Hg22+and Pb2+ions in an unknown and known solution. Fundamental theory or principle behind the experiment The fundamental principle behind this experiment is to be able to analyze the cations of the known solutions Ag+, Cu2+, and Fe3+ions and verify what solutions are present in the unknown solution which may vary in Ag+, Hg22+, and Pb2+ions. For this experiment, we will use Selective precipitation which is one of the simplest, but most successful ways to separate one metal cation from another. Method For this experiment, we will obtain a known mixture containing the group I cations and while using a clean dropper we will obtain 15 drops of the known solution and add it into a 75mm test tube. Then we will add a sufficient amount of drops of 6M HCl to complete precipitation. Once done we will centrifuge the tube with the solution for 2 minutes, decant the supernatant liquid from the precipitate and write down observations. Once the solution is completely precipitated we will start separating and confirming for lead. We will add 2mL of distilled water to the group I precipitate in the test tube and stir it with a glass rod while it heats up in boiling water for 3 minutes. Then heat up 4mL of distilled water in another test tube in the
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