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+ + SO42-

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 5:59:51 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

The equation Δ x Δp ≥ h/ 4Π   shows: (1) de-Broglie relation         (2) Heisenberg's uncertainty principle   (3) Aufbau principle (4) Hund's rule ans:  Heisenberg'

Molecule in itself is electrically stable so it cant act as ligand So that it can acts as the negative and pasitive ligand.


explain law of equivalence..

can you describe how the valance shell electron configuration affectst the reactivity of the elements in the lanthanides and actinides series?

What is the equation for the reaction of sodium nitroprusside with a ketone

Leibermann nitro test why we add concentrated acid

Do you do power point assignments and if you do, what is the turn around time?

Can we vary the pressure while phases remain in equilibrium? Consider a system containing only NH 4 Cl(s), NH 3 (g), and HCl(g). Assume that the equilibrium NH 4 Cl(s) ↔ NH