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Topic: Electrolysis  (Read 1860 times)

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Offline navin_pinki

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Electrolysis
« on: January 26, 2012, 12:38:06 PM »
Why during electrolysis, we do not get any product on anode, while we get positive ions get discharged at cathode, even though both are active electrode.

Example:During electro-refining of copper, anode and cathode both are of copper, that is active electrode. So why it happens that copper ion gets discharged at cathode but, sulphate ion or hydoxyl ion do not get discharged at anode.

Offline fledarmus

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Re: Electrolysis
« Reply #1 on: January 27, 2012, 09:06:22 AM »
Can you write the half reactions that occur at the anode and cathode? If so,

1) What is the product of the reaction at your cathode? What is the solubility of this product in your electrolyte solution?

2) What is the product of the reaction at your anode? What is the solubility of this product in your electrolyte solution?

Offline winkler

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Re: Electrolysis
« Reply #2 on: January 27, 2012, 11:57:50 AM »
Why during electrolysis, we do not get any product on anode, while we get positive ions get discharged at cathode, even though both are active electrode.

Example:During electro-refining of copper, anode and cathode both are of copper, that is active electrode. So why it happens that copper ion gets discharged at cathode but, sulphate ion or hydoxyl ion do not get discharged at anode.
A(oxidation process):Cu(s)------> Cu2+ + 2e-
K(reduction process):Cu2+ (formed in anodic step) + 2e- -----> Cu(s)

Offline fledarmus

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Re: Electrolysis
« Reply #3 on: January 31, 2012, 08:47:39 PM »
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