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Lab Setup question

  1. Dec 27, 2004 #1
    From the attachment: the recorded data

    Before CuO + porcelain boat = 62.869g
    CaCl2 + U tube = 80.483g

    After: Porcelain boat + contents = 54.869g
    CaCl2 + U tube = 89.483g.

    Why was the CaCl2 tube between the generator and the tube containing the porcelain boat?

    a) to absorb evaporated HCl
    b) to absorb evaporated H2O
    c) to slow down the gases released
    d) to absorb the evaporated Zn particles
    e) to remove the initial air that passes through the tube

    which one is the answer? Our teacher doesn't do much lab work with us so please help. thanks.

    Attached Files:

    Last edited: Dec 27, 2004
  2. jcsd
  3. Dec 28, 2004 #2
    does anyone know the answer to this problem? i don't understand it at all. Thanks.
  4. Dec 28, 2004 #3


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    Homework Helper

    Well, from a quick glance, here's my humble opinion:

    a)it's seems that this is a possibility

    b)Zn + HCl does not produce water, merely hydrogen gas and the resulting salt. If it isn't pure HCl, than it could be a possibility.

    C)probably not, although not completely sure. The question, I believe, refers to the common ion effect.

    D)should probably rule out this one. Zn gas particles exist in the form of ions and this is under high temperatures.

    E).......by now, my guess seems to be A or B, more towards B, although I highly advise a second opinion.
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