A sample of malachite, Cu2CO3(OH)2, is heated over a Bunsen burner to form CuO. The mass percent cop — Laboratory Chemistry Question
Question
A sample of malachite, Cu2CO3(OH)2, is heated over a Bunsen burner to form CuO. The mass percent copper in the sample is calculated based on the mass before and after heating. Which could explain the experimentally determined percent copper being lower than that expected for malachite?
A.
The sample is not heated as strongly as recommended in the procedure (not long or hot enough).
B.
The sample is heated more strongly than recommended in the procedure (too long or too hot).
C.✓ Correct
Azurite (Cu3(CO3)2(OH)2) is present in the sample.
D.
Goethite (FeO(OH)) is present in the sample.
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