. Suppose an unknown metal sulfate is found to be 72.07% SO 4 2- Assuming the charge on the metal cation is +3, determine the identity of the cation.
1. Suppose an unknown metal sulfate is found to be 72.07% SO 4 2-
Assuming the charge on the metal cation is +3, determine the identity of the
cation.
2. The unknown metal sulfates are hygroscopic and will absorb water from air. The
unknowns must thus be kept in desiccators to remove any absorbed water. How
would your results be affected if your unknown sample was not desiccated?
Would this error cause your calculation of the mass percent of sulfate in the
unknown to be too high or too low? Explain.
3. In this experiment you used an excess of the BaCl 2 solution. How would your
results be affected if you did not use an excess of the BaCl 2 solution? Would this
error cause your calculation of the mass percent of sulfate in the unknown to be
too high or too low? Explain.
4. In the last step of the procedure, you vigorously heated the BaSO 4 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 BaSO 4 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.
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