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Copper Cycle

In: Science

Submitted By kakhtar
Words 1120
Pages 5
Chem 102- 810
Lab partner: Amanda K
Experiment 11: Copper Cycle Lab Report

Objective: To observe a sequence of reactions involving copper that form a cycle; to develop better laboratory techniques; to gain skills in observing and interpreting observations; and to practice quantitative laboratory techniques.
1. Cu(s) + 4HNO3 (aq) ---------- Cu(NO3)2(aq) + 2H2O(g) + 2NO2(l)
2. Cu(NO3)2 (aq) + 2NaOH(aq) --------- Cu(OH)2(s) + 2NaNO3 (aq)
3. Cu(OH)2 (s) + HEAT ------------ CuO(s) + H2O(l)
4.CuO(s) + H2SO4(aq) ---------- CuSO4 (aq)+ H2O(l)
5.Zn(s) + CuSO4 (aq) ------------- ZnSO4(aq) + Cu(s)
Potential Hazards:
Concentrated nitric acid causes severe burns and the vapor is a lung irritant.
The hydrogen gas that is produced is flammable.
Concentrated hydrochloric acid causes severe burns.
Methanol is flammable. Keep away from all ignition sources.
Acetone is flammable. Keep away from all ignition sources.
1.Obtain about 0.5g copper. In the main fume hood, using a 250 mL beaker, prepare the Cu(NO3)2 by adding 4.0mL of concentrated nitric acid to the copper wire. ***Caution.
2.Add 30 mL of 3.0 M NaOH to precipitate Cu(OH)2. With stirring, heat just to boiling on a hot plate. This will change the insoluble Cu(OH)2 into insoluble, black CuO.
3.Let the CuO to settle, then decant the supernate liquid. Add about 200 mL of very hot distilled water, settle and decant a second time. Properly dispose of the supernate liquid.
4.Make sure the temperature of your solution is under 80 degree C, then add 15 mL of 6.0 M H2SO4 to convert the CuO into CuSO4 .
5.In the hood, add all at once 2.0g of 30 mesh zinc metal to precipitate copper metal. Keep stirring until the supernate liquid is colorless. Copper rapidly covers zinc. Use your stirring rod to crush the covered zinc to expose fresh zinc metal. ***Caution....

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