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
biography on Cecil E Boord

Which of the following is least soluble: (1) BeF 2                                              (2)  NaBr                  (3)  CaF 2                              (4

Acidic character order of phenon , ortho nitro phinol, para nitro phenol#

Monosaccharides - Biomolecules These are very simple one unit non-hydrolysable sugars. They have the common formula C n H 2n O n where n changes from 3 to 9 carbon molecules.

THE VOLUMETRIC DETERMINATION OF A GIVEN ACETIC ACID SOLUTION REQUIRED BY USING 100 ML. OF A STANDARD CAUSTIC SODA SOLUTION. Compound Microscope 1. Procedure for st

What is the effect of more electronegative atom on the strength of ionic bond: (1) Decreases (2) Increase (3) Decreases slowly (4) Remains the same Ans:  Increase

When  Nacl  is dissolved in water the sodium ion becomes: (1) Oxidized                                       (2) Reduced   (3) Hydrolysed           (4) Hydr

Polarization in a dielectric on application of electric field is Displacement/separation of opposite charge centres.

how electrode potential through nernst equation can be determind/

Calculate equivalent weight of 99.22% purity of hexamethylene diisocyanate (HDI)?