Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 2Al + 3CuCl2 -> 3Cu + 2AlCl3 Mass of Cu = ?

  1. Feb 1, 2010 #1
    URGENT:Sources of Error that Impact the Percentage Yield

    This is my chem lab on the reaction 2Al + 3CuCl2 --> 3Cu + 2AlCl3.

    So my question is:
    1. What sources of error in the experiment would affect the percentage yield of reaction?
    2. In what ways this experiment could be improved?

    Purpose: to find the percentage yield of copper in the reaction.

    1. Add enough distilled water to dissolve the 0.51 g of CuCl2 (s) in the beaker.
    2. Record the colour of the resulting solution.
    3. Measure out 0.25 g of the aluminum and add this to your solution.
    4. Leave the beaker on your lab desk and allow the reaction to go to completion.
    5. When the reaction is completed, record your observations.
    6. Use the forceps to collect all copper formed. Carefully transfer the copper to a beaker and rinse the copper with water.
    7. Pour off as much of the rinse water as possible. Spread the copper on the bottom of the beaker.
    8. Cover the beaker containing the wet copper with a watch glass and gently heat the beaker on a hot plate to dry the copper. Reduce heat if the copper begins to turn black.
    9. When the copper is dry completely, determine the mass of copper.

    Thanks Millions! Please help! I'd really appreciate it!! =]
    Last edited: Feb 1, 2010
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted