Question

1) When the sample is first put into the crucible and heated, the directions say to heat gently for the first five minutes. why do you suppose this is important?

2) Suppose that some of the compounds spilled out of the crucible after it was heated. Would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? Briefly explain your answer.

3) The unknown compounds used in this experiment are the following compounds. Based on your experimental results, what is the identity of the unknown compound you used? Show all calculations needed.

Compound: CaSO4. 2H2O, MgSO4.7H2O, BaCl2.2H2O, ZnSO4.7H2O

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