Identification of Copper (Ii) Chloride

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Identification of Copper (II) Chloride Introduction Through a series of cation and anion confirmation and elimination tests, the identity of an unknown compound can be determined. By subjecting certain standards to a series of tests, it will be known how they react when trying to identify the unknown. The results of these tests are crucial to correct identification of the unknown compound. Materials and Methods 0.5 grams of the unknown 11 was added to 5 mL of distilled water in a centrifuge tube to make the stock solution. To determine the cation, 6 M NaOH was added dropwise to the unknown solution until a precipitate was formed. To test whether the precipitate formed was amphoteric or not, excess NaOH was added dropwise to the solution. Observations were recorded. The contents of the centrifuge were disposed of in the designated containers. Another stock solution was made. 15 M ammonium was added dropwise until a colored complex was formed. Excess 15 M ammonium was added to the solution to test if it was amphoteric. Observations were recorded. A flame test was then conducted and the identity of the cation was determined. To determine the anion, the anion had to be separated first from the cation in the unknown compound. To do this, 0.1 grams of the unknown compound and 0.5 grams of sodium carbonate had to be boiled in 5 mL of distilled water. Once the solution boiled for 10 minutes, the precipitate was centrifuged out and the anion solution was left. 0.1 M silver nitrate was added to the anion solution and a precipitate was formed. Dilute HNO3 was then added dropwise to the precipitate until it became acidic. The supernatant was decanted out and the precipitate remained. 5 mL of distilled water was added to the centrifuge tube with the precipitate. 6 M HNO3 was then added dropwise to the precipitate until the solution was acidic. 3-4

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