Copper Drops of Stock Solutions and Strips of Copper Reaction Time Test Tube KMn

Question

Copper

Drops of Stock Solutions and Strips of Copper

Reaction

Time

Test Tube

KMnO4

H2O

H3O^+/H2SO4

C2O4H2

Strips of Copper

F-1

15

15

15

5

None

5 min 8 sec

F-2

15

15

15

5

1

3 min 10 sec

F-3

15

15

15

5

2

2 min 20 sec

a. What effect does the presence and amount of copper have on the rate of the reaction?

b. Does it appear that the copper reacted during the course of the reaction?

c. Could you have predicted the effect of copper on the rate of this reaction, based on the equation of the overall reaction taking place? Explain your answer.

Copper

Drops of Stock Solutions and Strips of Copper

Reaction

Time

Test Tube

KMnO4

H2O

H3O^+/H2SO4

C2O4H2

Strips of Copper

F-1

15

15

15

5

None

5 min 8 sec

F-2

15

15

15

5

1

3 min 10 sec

F-3

15

15

15

5

2

2 min 20 sec

Explanation / Answer

From the given data in the table above

a. When the reaction was performed without the presence of any copper, the reaction was slow and the run time was thus very high. when copper strip was added, the oxidation reaction speeds up and thus run time is lowered. As the amount of copper in increased, the run time simultaneously decreased..

b. The increase in reaction rate (reduction in run time) suggests that copper has reacted in the reaction,

c. copper acts as a sacrifical metal in the reaction and thus the addiiton of copper strip speeds up the reaction in the forward direction.

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