In this experiment you used an excess of the BaCl2 solution. How would your resu

Question

In this experiment you used an excess of the BaCl2 solution. How would your results be affected if you did not use an excess of the BaCl2 solution? Would this error cause your calculation of the mass percent of sulfate in the unknown to be too high or too low? Explain. 3. 4. In the last step of the procedure, you vigorously heated the BaSO4 precipitate wrapped in filter paper in a crucible. How would your results be affected if tiny pieces of the filter paper still remained mixed in with the BaSO4 after heating? Would this error cause your calculation of the mass percent of sulfate in the unknown to be too high or too low? Explain

Explanation / Answer

Ans 3 :

The BaCl2 is added in the experiment in excessso that it can precipitate baroum sulfate.

This precipitate can then be digested in a hot solution and filtered and ashed to determine the percentage weight of sulfate in the sample.

If BaCl2 is not used in excess , not all the BaSO4 will be precipitated and hence the amount of sulfate calculated in the sample will come out to be too low.

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