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Unit 2 Chemistry Lab

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1. Part A.2. What is the formula and the color of the gas that is evolved?
The name of the brown colored gas is nitrite, and its formula is NO2 (Beran, 2014).
2. Part B.1. When the NaOH solution is added, Cu(OH)2 does not precipitate immediately. What else present in the reaction mixture from Part A reacts with the NaOH before the copper(II) ion? Explain.
The other compound present within the reaction mixture that came from Part A is water, H2O, which reacts with the NaOH before the copper(II) ion (Beran, 2014).
3. Part C.1. The sample in Part B was not centrifuges. Why? Perhaps the student chemist had to be across campus for another appointment. Because of the student’s “other priorities” the percent recovery of copper will decrease. Explain why. …show more content…
4. Part D.1. All of the CuO does not react with the sulfuric acid. Will the reported percent recovery of copper in the experiment be too high or too low? Explain.
The final percent recovery of copper in the experiment will be too low, because not enough copper sulfide will be yielded by the reaction, which will be consequently used by the reactions in the final steps of the experiment (Beran, 2014).
5. Part E. Sulfuric acid has a dual role in the chemistry of this experiment. What are its two roles in the recovery of copper

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