The Copper Cycle Prelaboratory Assignment Partne(s)Name:, Date: Name: 1. Two of
ID: 1033574 • Letter: T
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The Copper Cycle Prelaboratory Assignment Partne(s)Name:, Date: Name: 1. Two of the reactions in the "Copper Cyele" are classified as oxidation -reduction (redox") Identify the two reactions, and identify the oxidizing agent and the reduacing agent in each oxidizing agentHNO3 reducting agentCu ox idizingCu redocting zn 2. Which one of the redox reactions above can be classified as a single displacement reaction? Inu604-? ?? + 1604 3. One of the reactions in this experiment is classified as a decomposition reaction. Identify it: CuloH)+heat Cuot 2 4. One of the reactions in this experiment is classified as a precipitation reaction. Identify it: CuIOA) CU(No3)-+2 NaOH Cu(OH) 2 Na No3 s. One of the reactions in this experiment is classified as an acid-base reaction. Identify it: HNO31 bo 6. How many reaction trials are to be completed? Are the trials completed sequentially or concurrently? 7. Which reaction requires a boiling water bath? Which reaction(s) use the centrifuge? S. In Reaction A, students are instructed to add no more than 0.25 ml. of 15 M nitric acid. What volume of 15 Af nitric acid is required to react with 0.030 g of copper metal? If 1.0 mL of acid contains approximately drops, how many drops of nitric acid are needed? 9. A student uses a 0.0245 g sample of copper wire to perform the Copper Cycle experiment. If 0.0132 g of dry copper is recovered upon completion of the reaction eyele, caleulate the percent recovery of cu. $1 Experiment: The Copper CycleExplanation / Answer
6) Ans:
Two reaction trails are completed. These trails are completed concurrently. Oxidation and reduction occurs at the same time in these reactions.
7)
Cu(OH)2 (s) + heat ? CuO (s) + H2O(l)
This reaction requires a boiling water bath.
Cu (s) + HNO3 (aq) ? Cu(NO3)2 (aq) + NO2 (g) + H2O (l)
Cu(OH)2 (s) + heat ? CuO (s) + H2O(l)
CuSO4 (aq) + Mg (s) ? Cu (s) + MgSO4 (aq)
These reactions uses the centrifuge tube.
8) Ans:
Weight of Cu metal is 0.030 g
Density of Cu metal is 8.96 g/cm3
Volume of Cu = Desity x weight
= 0.030 x 8.96
Volume of Cu = 0.2688 mL
moles of Cu = weight / molar weight
= 0.030 / 63.546
= 0.000472 moles of Cu
Molarity = moles/volume
= 0.000472 / 0.2688
= 0.001755 M
M1V1 = M2V2
0.001755 x 0.2688 = 15 x V2
V2 = 0.00003145 mL
0.00003145 mL volume of nitric acid is required with 0.030g of copper metal.
1mL contains 20 drops of acid .
0.00003145 mL contains (20 x 0.00003145 =0.000629 ) drops.
9) Percent recovery of Cu = (0.0132 g / 0.0245 g) x 100
= 53.878 = 54 %
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