Empirical Formula of a Hydrate-CE

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Lab#7: Empirical Formula of a Hydrate-Laurie Chan 11/13/2008

Conclusion and Evaluation:

Aspect 1        Based on the interpreted data of group “A”, the empirical formula of aluminum chloride did not stay the same. The expected empirical formula was. In group “A” the empirical formulas are as followed...

        So, as a group, we all had a different outcome of the empirical formula but the percent composition of water is the same for all. 11.2% for hydrogen and 88.8% for oxygen as shown in table #7.3.

        A random error would be the measurement of the hydrate crystal. A scoopula was used to measure 3g. Also another one would be the electronic balance having an uncertainty of ±0.001g. A systematic error would be heating the evaporating dish through a wire mesh instead of a clay triangle.

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        You notice that the theoretical yield and experimental yield values are shown in a pie graph. Both of the pie graphs are the exact same as both percentages are 11.2% and 88.8%. In these pie graphs, neither trends nor patterns apply.

Aspect 2        The procedural weaknesses are stated above. For example the measurement of the hydrate crystal would’ve affected the lab. There wasn’t an accurate measurement so that could’ve affected the weight of the final product or the reaction of the product. Another weakness was that the evaporating dish was being heated through a wire mesh instead of a clay ...

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