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Topic: Grade 12 Electrochemistry  (Read 139 times)

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Offline jax_gr12

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Grade 12 Electrochemistry
« on: October 11, 2021, 02:18:35 AM »
Hey!

I need help regarding electrochemistry. I will post my questions down below and feel free to reach out to me if you have an answer to any of my questions.

1. Do all electrolytic cells have inert electrodes? If not, then could you please provide an example?


2. When does the Epotential of a cell mean? When I calculate it what does that tell me?

My Guess: Tells how much voltage a cell needs to run.

3. When I find the Epotential of an ELECTROLYTIC CELL, why does it say the minimum voltage required is positive xyz.

For Example: SnCl = Sn2+ + Cl2

Esn = -0.14V <- Reduction, Oxidizing Agent, Cathode, -ve electrode
Ecl = 1.36V <- Oxidation, Reducing Agent, Anode, +ve electrode

Ecell = Ecathode - Eanode
       = -0.14 - 1.36
       = -1.50V

Why does it say it needs 1.50Volts to get the cell to run instead of -1.50V


Offline Borek

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Re: Grade 12 Electrochemistry
« Reply #1 on: October 11, 2021, 02:53:30 PM »
1. Do all electrolytic cells have inert electrodes? If not, then could you please provide an example?

Many cells can work both as galvanic and electrolytic. Think batteries. Can you think of a galvanic cell that has non-inert electrodes and can be applied external voltage to get charged?

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