1.) Electrolysis experiment A is run to completion with the following parameters
ID: 926463 • Letter: 1
Question
1.) Electrolysis experiment A is run to completion with the following parameters: The positive terminals is made of Zn, the negative terminal is made of Zn, the solution is Zn(NO3)2, the current is set to 12.00 A, and the time is set to 8 min. The final mass of the positive terminals is 8.05 g, and the final masss of the negative terminals is 11.95 g. Thus, the total mass of Zn metal that is electropated is 1.95 g.
2.) Electrolysis experiment B is run to completion with the following parameters: The positive terminals is made of Zn, the negative terminal is made of Zn, the solution is Zn(NO3)2, the current is set to 3.00 A, and the time is set to 8 min. The final mass of the positive terminal is 9.51 g, and the final mass of the negative terminal is 10.49 g. Thus, the total mass of the Zn that is electropated is 0.49 g.
3.) The ratio change in mass between the experiments A and B is equalt to 4 to 1. This corresponds to an identical ratio between the two experminets values for current.
This is not really a question but I did not know how to post the answers to the website. Thank you!
Explanation / Answer
Zn2+ + 2e = Zn(s)
Based on Faradays Law for electrolysis:
mZn = QxMMZn/2xF = IxtxMMZn/2xF = Ix(txMMZn/2xF)= constantxI
It is clear that the mass of Zn is proportional to the current I.
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