Alexes Montalvo Chem 1500-10 September 26, 2012
The Copper Cycle
The Copper Cycle is a popular experiment used to determine if an element, in this instance, copper, reverts to its elemental form after a chain of reactions. This experiment is very dangerous because of the reactions between the strong acids and bases. In this experiment I performed a series of reactions starting with copper metal and nitric acid to form copper (II) nitrate. Then I reacted copper and several other solutions such as, sodium hydroxide, sulfuric acid, ammonium hydroxide, and hydrochloric acid to form precipitates. In conclusion my percent recovery of copper was 100% due to the adequate amounts of solutions and achievement of proper chemical reactions.
Equipment and Materials:
← Copper Metal (penny) ← Nitric Acid (HNO3)(aq) ← Sodium Hydroxide (NaOH)(aq) ← Sulfuric Acid (H2SO4)(aq) ← Ammonium Hydroxide (NH4OH)(aq) ← Hydrochloric Acid (HCl)(aq) ← Zinc powder
← 2 100 ml Beakers ← 250 ml Waste Beaker ← 400 ml Beaker ← Filter paper ← Plastic Dropper ← 250 ml Erlenmeyer Flask ← Forceps ← Plastic Funnel ← Red Litmus paper ← Spatula ← Steel Wool ← Glass stirring rod ← Small test tube ← Tongs ← Wash bottle ← Watch Glass
I. Weigh a pre-1982 penny (should be around 3 grams)
II. Measure 2mL of concentrated nitric acid, HNO3(aq), into a 100 ml beaker under a fume hood. Place penny into the beaker of nitric acid and observe the reaction. After 5 seconds remove penny with forceps and place into second beaker.
III. Add approximately 25mL of deionized water into second beaker to remove any remaining copper ion traces and place rinse into first beaker with nitric acid. Record your observations of the copper (II) nitrate, Cu(NO3)2. Dry and weigh the penny to see how much of