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
Geiger Marsden experiment The Rutherford experiment (also known as the Gold foil experiment or the Geiger-Marsden experiment) was an experiment to probe the structure of the at

Which of the following is an incorrect representation for a neutral atom: 108/47Ag 63/30Cu 30/15P 13/6C 6/3Li

during the process of extraction of pure copper from copper pyrite,SiO2 acts as acidic flux which combines with iron oxide(FeO) to form iron silicate(FeSiO3). CuFeS2 + heat ---> Cu

Alkyl ligands form metal carbon σ bonds. Usually they occur in conjunction with other organic ligands or CO, but may be achieved on their own, as in tungsten hexamethyl (1), and

The frequency of one of the lines in Paschen series of hydrogen atom is2.340x10 11 Hz. The quantum number n 2 which produces this transition is: (1) 6               (2) 5

color formation of d-block elements

LITHIUM AND BERYLLIUM MARKEDLY DIFFERENT FROM OTHER MEMBERS OF THEIR RESPECTIVE GROUP?.

The statements: (1)  In filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular o

Stearic effect - relative reactivity of aldehydes and keto The size of the alkyl group is much more than that of hydrogen. In aldehydes, there is one alkyl set although in keto

In a potassium atom, electronic energy levels are in the following order: (1) 4s>3d                              (2) 4s>4p              (3) 4s (4) 4s Ans: 4s