Question

An unknown metal sulfate is found to be 55.66% SO42 by mass. Assuming that the charge on the metal cation is +3, determine the identity of the cation 1. 2. The unknown metal sulfates are hygroscopic and will absorb water from air. They must thus be kept in desiccators to remove any absorbed water and keep them dry. How would your results be affected if your unknown sample was not desiccated? Would you obtain a hig her or lower mass percent of sulfate in the unknown? Explain. 3. 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 you obtain a higher or lower mass percent of sulfate in the unknown? Explain. 4 At the end of the procedure, you heated the 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 precipitate after heating? Would you obtain a higher or lower mass percent of sulfate in the unknown? Explain.

Answer 1

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