What is present in solution? What is the gas? How do you know? What are you remo

Question

What is present in solution? What is the gas? How do you know? What are you removing by washing? What color is your copper sample? Is it uniform in appearance? Name Date Desk Laboratory Instructor REPORT SHEET EXPERIMENT Chemical Reactions of Copper 6 and Percent Yield 1. Initial mass of copper 2. Mass of copper and evaporating d 3. Mass of evaporating dish 4 Mass of recovered copper 5. Percent yield (show calculations) el31034 42.9241 g 6. Describe the reaction Cu(s) + HNO3(aq) Culus)tlaet ao-g> t 2Heo Describe the reaction Cu(NOJ2(aq) +NaOH(ag)-&CoHa; teteol 3dum hyroride satun sk, He arge, .tewe blue 2una ) fins 7. got Cv0(,) + H 8. Describe the reaction Cu(OHHs) 9. What are you removing by this washing? neacke inpih 10. What copper compound is present in the beaker? Cener Tufak 11. Describe the reaction Cusolaq) + Zrds), eteet-- 12. What is present in solution? 13. What is the gas? 14. How do you know? 15. What are you removing by washing? 16. What color is your copper sample? 17. Is it uniform in appearance? 18. Suggest possible sources of error in this experiment. 63

Explanation / Answer

11. CuSO4 (aq) + Zn (s) --> ZnSO4 (aq) + Cu(s)

12. From 7th question it is NaNO3 (aq) Sodium Nitrate

13. The gas is Nitrogen dioxide NO2(g)

14. Nitrogen dioxide is a deep red-orange (sometimes reddish-brown) colored gas.

15. Unreacted reactants and NaNO3

16. Cu(II) oxide is CuO it is black in color.

17. Yes it is uniform in appearance.

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