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+ + 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

 


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

Lanthanides & acinides, 1. why YbS and YbI2 are semiconducting solids but L...

1. why YbS and YbI2 are semiconducting solids but LaS and LaI2 show metallic character. 2. Why is aqueous solution of Eu2+ thermodynamically less susceptible to oxidation than any

How many unpaired electron are present, How many unpaired electrons are pre...

How many unpaired electrons are present in Ni 2+   cation  (atomic number = 28): (1) 0        (2) 2        (3) 4        (4) 6 Ans:  2

Chemical properties of tri-halides - oxidation , Chemical properties of Tri...

Chemical properties of Tri-halides - Oxidation  Phosgene is very poisonous gas. To use chloroform as an anaesthetic agent, it is required to save the reaction. The specified tw

Uses of proteins - biomolecules, Uses of Proteins (a) Proteins constitu...

Uses of Proteins (a) Proteins constitute as necessary part of our food. Meat, eggs, fish, cheese offer proteins to human beings. (b) In textile: Casein (a milk protein) is u

Periodic trends, what can you deduce about the relationship between ionizat...

what can you deduce about the relationship between ionization energy and reactivity of metals

Atom of a chemical element, The atomic weight is the weight of an atom of a...

The atomic weight is the weight of an atom of a chemical element.  For instance, the atomic weight of oxygen is 15.9994 and the atomic weight of hydrogen is 1.0079.  Write a script

Working of galvanic cell, Q Explain Working of Galvanic Cell? Ans. The...

Q Explain Working of Galvanic Cell? Ans. There are several types of electrochemical cells. One type of electrochemical cell is called a galvanic cell . (A battery is a galvan

Calculations of volumetric analysis, Calculations of Volumetric analysis ...

Calculations of Volumetric analysis The subsequent points should be kept in mind while making calculations of volumetric exercises. (i) 1g equivalent mass of a substance car

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