November 29, 2024, 11:48:30 PM
Forum Rules: Read This Before Posting


Topic: Electrolysis and Faradays  (Read 1728 times)

0 Members and 1 Guest are viewing this topic.

Offline DavidCM

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
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

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27865
  • Mole Snacks: +1813/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
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 »
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline DavidCM

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
Re: Electrolysis and Faradays
« Reply #2 on: December 21, 2023, 12:26:23 PM »
Thank you so much!! I got it.

Sponsored Links