AP Chemistry : Electrolysis and Faraday's Law

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Electrolysis And Faraday's Law

How many grams of Cr can be obtained by the electrolysis of a Cr(NO3)3 if 10 amps are passed through the cell for 6 hours?

Possible Answers:

19.4 g

38.8 g

12.5 g

103 g

56.3 g

Correct answer:

38.8 g

Explanation:

Example Question #2 : Electrolysis And Faraday's Law

How much Al would be precipitated if an AlCl3 solution was electrolyzed for 1.00 hours with 5.00 amps?

Possible Answers:

0.84 g

3.36 g

6.72 g

1.25 g

1.68 g

Correct answer:

1.68 g

Explanation:

Example Question #3 : Electrolysis And Faraday's Law

What current must be past through a solution of AlCl3 for 1.19 hours to produce 40g of solid Al?

Possible Answers:

50.0  amps

10.5 amps

125   amps

100.  amps

75.3  amps

Correct answer:

100.  amps

Explanation:

Example Question #4 : Electrolysis And Faraday's Law

In the electrolysis of CaCl2 a 1.15 amp current is passed through the cell for 5.0 hours.  How much Ca is produced?

Possible Answers:

18.3 g

2.2 g

1.1 g

8.6 g

4.3 g

Correct answer:

4.3 g

Explanation:

Example Question #5 : Electrolysis And Faraday's Law

How long would it take to electroplate 28.3g of silver at a constant current of 2.0 amps from a solution of silver nitrate?

Possible Answers:

422 min

53 min

105 min

844 min

211 min

Correct answer:

211 min

Explanation:

 

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