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Topic: Electrolysis and Faradays  (Read 602 times)

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Offline DavidCM

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Electrolysis and Faradays
« on: December 21, 2023, 11:47:06 AM »
Hi. I'm trying to solve this problem but I am not able to find what can I do.

How many grams of Zn metal and chlorine are released at the electrodes of an electrolytic cell containing an aqueous solution of ZnCl2, if 1.80 faradays are passed through it?

First of all, the semi-reactions:

Zn2+ + 2e :rarrow: Zn(s)
2Cl- :rarrow: Cl2(g) + 2e-

1 Faraday = 1 C/mol e, so we have 1.80 · (96485) C/mol e.

But now... I can't find what should I do.

Offline Borek

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Re: Electrolysis and Faradays
« Reply #1 on: December 21, 2023, 12:09:00 PM »
1 Faraday = 1 C/mol e, so we have 1.80 · (96485) C/mol e.

Something is wrong here, even if you are on somewhat right track that moles, Coulombs and faradays are related.

1 Faraday is just a mole of electrons. You need two electrons per Zn2+, you can easily calculate how many moles of Zn were deposited (this is actually Faraday's law of electrolysis).
« Last Edit: December 21, 2023, 03:11:10 PM by Borek »
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Offline DavidCM

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Re: Electrolysis and Faradays
« Reply #2 on: December 21, 2023, 12:26:23 PM »
Thank you so much!! I got it.

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