EXPT 3:
Percent Composition
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Experiment 3 - Percent Composition

Procedure:

Part B - Examination of Residue

  1. Place 3 test tubes in a test tube rack. Label the test tubes as #1, #2, and #3.
  2. Use a spatula to transfer a scoop of the following samples into each of the test tubes.

    Test tube
    Sample
    #1
    potassium chloride
    #2
    residue from crucible
    #3
    potassium chlorate

  3. To each test tube add about 5 mL of distilled water to each test tube and shake to dissolve. Record your observations on the data sheet.
  4. To each test tube add about 3 drops of dilute nitric acid (HNO3) and mix. Record your observations on the data sheet.
  5. To each test tube add about 5 drops of AgNO3 and mix. Record your observations on the data sheet.
If silver chloride (AgCl) is present, it will appear as a white precipitate.

 

 



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