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Homework Help: Questions Chrome Alum

  1. Apr 10, 2005 #1
    Hi. I got some questions I need to answer. Just to make sure I'm correct I would appreciate if someone could comment on my answers.

    1. Q. When calculating the theoretical yield of an alum that has water molecules attached to the double salt. Are these included in the calculation?
    A. I should include the water molecules.

    2.Q. Why does is produce a more reliable yield to let an alum solution cool in a refrigerator.
    A. The reaction goes more slowly.

    3.Q.How can I test the alum for waters of hydration?
    A. By subtracting the water molecules

    4. Q.Why is the melting point of an alum lower than the actual melting point?
    A. Not pure enough.
  2. jcsd
  3. Apr 13, 2005 #2
    Your answers are correct but Im not sure about #3.
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