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Homework Help: Explanation of a chemical reaction

  1. Aug 8, 2009 #1
    Good afternoon,

    The following experiment+observation is given. I look for the explanation of the observations (means: why 1. a white residuum appears and 2. why a blue fluorescence is detected).

    Brass consists of zinc, tin and copper, the following reaction shall analyse these properties:
    1. Solubilize in in half concentrated HNO3
    2. Evaporation until dry
    3. Add diluted HCl
    -> a white residuum appears
    4. Add zinc-granules
    5. Heating in a test tube (half fulled with water)

    -> observation: blue fluorescence

    I assumed that the white residdum is zinc!?

    Thank you very much for your aid.

  2. jcsd
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