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secondary 4 | Chemistry
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secondary 4 chevron_right Chemistry chevron_right Singapore

Can someone explain to me how to do part (c)
on pg (4)9

Date Posted: 5 months ago
Views: 38
Eric Nicholas K
Eric Nicholas K
5 months ago
Good morning Annela!

Here is my opinion for this question. I only specialise in A Maths so I may not be of much help in Chemistry.

I have given this question some thought. Now, if we were to use copper electrodes in place of carbon electrodes, this is what I think will happen.

As you know it very well, even the solution contains copper. This means that during the electrolysis, the concentration of the copper ions in the copper something solution remains unchanged. This is in stark contrast to the ones using carbon electrodes, where the concentration of copper ions decreases as the copper ions get deposited in the negative electrode.

This in turn affects the speed of reaction. The cathode will see a faster rate of depositing of copper as the concentration of the copper ions are higher than its counterpart with the carbon electrodes. Probably at a constant rate because the concentration remains unchanged throughout. So I would expect less time to be logged for reaching a specific mass milestone, or equivalently, I would expect a higher mass to be deposited for every 10 seconds.

Having said that, I am not sure whether the maximum mass of extra copper deposited (I use extra here because the electrode is already copper in itself) will change or not. I doubt it should change since the copper solution simply acts to maintain a constant concentration and a constant flow.

EDIT: On second thought, the maximum mass of extra copper deposited might be different. In the first with carbon, the reaction stops when the copper concentration gets very low (approaches zero) while in the second with copper, the reaction stops when all the copper at the anode “dissolves”, so it would be highly dependent on the mass of copper anode used.

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Eric Nicholas K
Eric Nicholas K's answer
4447 answers (Tutor Details)
Good afternoon Annela! Something like this would be good for writing.
Eric Nicholas K
Eric Nicholas K
5 months ago
I have included my full opinion in the main question’s comments section.