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4. Thoroughly explain why your experimental mass percent is different from the theoretical value.Think about what you observed: Was there any color remaining in the solution after your vacuum filtration? Wasany copper metal lost in transfer or filtration? Was the copper metal still moist when it was weighed?Be specific as to how each possible source <strong>of</strong> error would have affected the outcome; that is, caused the masspercentage <strong>of</strong> copper to be higher or lower than the theoretical value.Finally, explain where you could improve your technique if you repeated the experiment.5. Thought Question: How did the change in mass <strong>of</strong> the aluminum rod compare to the mass <strong>of</strong> copper producedby the chemical reaction? Larger? Smaller? The same? And is this result consistent with your expectation?Explain your reasoning.C. Graham Brittain Page 9 <strong>of</strong> 9 9/28/2010
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