write a shortnote on electrorefining of copper? , Chemistry

Electro refining of Copper
• Electrolyte - Aqueous copper sulphate solution (acidified)
• Cathode - Pure copper metal (thin rod)
• Anode - Impure copper metal (thick block)
• Dissociation of copper sulphate -

Cathode pure thin sheet of copper lined with graphite so that the deposited copper can be removed easily.
Anode blister copper (got above)

Electrode reaction

Copper sulphate dissociates

CuSO4 ------------Cu2+ + SO2-4

H2O -------- H+ +OH

At the cathode the copper ion changes to copper atom by gaining two electrons which get deposited in the pure copper rod.

Cu2+ +2e- ------- Cu

The sulphate ion and hydroxide ion move towards anode but none of them is discharged.The copper anode itself loses electrons and gives copper ion in the solution.

At the anode Cu - 2e------- Cu2+


The impure block of copper thus will be used The impurities settles at the bottom of the electrolytic cell. This is known as anode mud or slime.
The impurities iron, zinc etc ionize and dissolves in the copper sulphate solution. They are above copper in the activity series. So they can displace copper from copper sulphate solution.The weight of cathode will increase. The copper obtained is 100%pure.e

Posted Date: 3/7/2013 5:23:19 AM | Location : United States







Related Discussions:- write a shortnote on electrorefining of copper? , Assignment Help, Ask Question on write a shortnote on electrorefining of copper? , Get Answer, Expert's Help, write a shortnote on electrorefining of copper? Discussions

Write discussion on write a shortnote on electrorefining of copper?
Your posts are moderated
Related Questions
Describe the mechanism of ferromagnetism Ferromagnetism is the basic mechanism by which certain materials (like iron) form permanent magnets or/and exhibit strong interactions

how alkenes oxidise with potassium


Explain relative electronegativities An analysis of relative electronegativities would suggest that, because C is slightly more electronegative than H, a important amount of th



Q. Show Equilibrium expression for water? Ans. The equilibrium expression for water is equal to a constant, Kw. This constant is called the ion product of water and is equ

Vulcanization of rubber The procedure of heating natural rubber with sulphur to enhance its properties is known as vulcanization. Vulcanization was illustrated by Charles Goody

in an electrophoresis experiment , spherical colloidal particles of diameter 0.5 um are disperside in a solution of 0.10mol per litter nacl , if the particles are observed to cover

Antihistamines: Antihistamines are chemical substances that abolish/diminish the major actions of histamine released in the body and therefore avoid the allergic effects. Alter