write a shortnote on electrorefining of copper? , Chemistry

Assignment Help:

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


Related Discussions:- write a shortnote on electrorefining of copper?

Dithizone, can -COOH group be attached with the phenyl group of dithizone?

can -COOH group be attached with the phenyl group of dithizone?

Addition reactions, reaction of bisulphite with acid chlorides

reaction of bisulphite with acid chlorides

What are distinguishing characteristics of metallic bonding, What are disti...

What are distinguishing characteristics of metallic bonding?  Metallic  state  can  be  visualized  like an  array  of positive  ions,  with  a  common  pool  of electrons to

Manufacture of cement, Manufacture of cement Cement is a composite mixt...

Manufacture of cement Cement is a composite mixture of calcium silicates & calcium aluminates which is a popular material used for construction. 1) Raw materials : Raw material

An electronic transition between which orbits in hydrogen, The third line i...

The third line in Balmer series corresponds to an electronic transition between which Bohr's orbits in hydrogen: (1) 5 → 3               (2) 5 → 2      (3) 4→ 3

Metelurgy, general principle on metelurgy

general principle on metelurgy

Total genetic repertoire, Assume a cell possesses 1000 genes, but at any po...

Assume a cell possesses 1000 genes, but at any point in time, ten percent are being used (i.e., "expressed"). If a typical protein has 100 amino acids, what is the total number of

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd