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
Q. Physical Properties of group16? Similar to the groups discussed earlier. The metallic character in Group 16, increases with increasing atomic number. Oxygen and sulphur are

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

Elements of Group 13 are namely, boron, aluminium, gallium, indium and, thallium. While studying the alkali and alkaline earth metals, you have seen that all the elements of these

If molecular mass and atomic mass of sulphur are 256 and 32 respectively, its atomicity is: (1) 2        (2) 8         (3 )4        ( 4)16 Ans: 8

Which one is least ionic in the following compounds: (1) Agcl (2)  Kcl   (3) Bacl 2                              (4) Cacl 2 Ans: Agcl

What Sort of Panel Is Required for Acceptance Tests? Consumer panels are the best group to use for evaluating the acceptability of a product or a range of products because the

The azimuthal quantum number is related to: (1)  Size (2) Shape (3) Orientation     (4) Spin Ans:  Shape

what is fehlings test and its reagent?

Which of the following are isoelectronic species                  I= CH + 3 , II-NH 2 , III- NH + 4 , IV-NH 3 (1) I, II, III              (2) II, III, IV  (3) I, II

No, it does not depend upon concentrations of reactants, From the Arrhenius equation,  k = Ae^(-Ea/RT) We can say, that it is dependent on activation energy(Ea) and temperatu