Suppose two students in one of our lab classes decided to heat their copper sulf

Question

Suppose two students in one of our lab classes decided to heat their copper sulfate crystals to determine the number of waters of hydration. One student used a boiling water bath and the other used a bunsen burner for heating. Both students heated their crystals until the mass was constant. The student who used a boiling water bath determined that there were two waters of hydration. The student who used the Bunsen burner determined that there were 5 waters of hydration. Which of the following statements best explains the source of the discrepency? a. Clearly one of the students made a mistake when determining masses of the crystals before and after heating. b. The student who used the water bath should have heated the sample for longer since a boiling water bath can only reach 100oC. c. The student using the Bunsen burner decomposed the sample resulting in a lower than expected mass. d. The waters of hydration are driven off at different temperatures for the copper sulfate hydrate.

Explanation / Answer

b.) The water bath can heat the CuSO4*5H2O only to 100C. The Bunsen burner can reach 500+ C.

100 correct

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