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+ + SO2-4

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?

Amount of heat , A 0.5 m 3 rigid tank is filled with saturated liquid wate...

A 0.5 m 3 rigid tank is filled with saturated liquid water at 200 o C. A valve at the bottom of the tank is opened, and liquid is withdrawn from the tank. Heat is transferred to t

Physical properties of elements of group 13, Elements of Group 13 are less ...

Elements of Group 13 are less metallic than those of groups 1 and 2. Within the group, there is a variation in metallic character. Boron, the smallest element in this group is a no

Soda lime glass and safety glasses, Q.   Write an account of soda lime glas...

Q.   Write an account of soda lime glass and safety glasses. Ans. Soda-Lime Glass or soft glass: It is the ordinary glass in which Na 2 O is added to the melt to oxide on hea

#electrochemistry, The emf of the cell Cd/CdSO4(0.0093M)//CdSO4/Cd is 0.086...

The emf of the cell Cd/CdSO4(0.0093M)//CdSO4/Cd is 0.086V at 25°C find the value of X solution

Water and its treatment, hardness of borewell water is less than that of se...

hardness of borewell water is less than that of seawater

Complex formation-equilibrium constants, Equilibrium constants A complex...

Equilibrium constants A complex in general is any species build by specific association of molecules or ions by donor-acceptor interactions. In aqueous solutions the most import

Stoichiometry HW Help, Need help figuring out the proper steps on how to so...

Need help figuring out the proper steps on how to solve: What volume of 1.25M HCl in liters is needed to react completely (with nothing left over) with 0.750L of 0.200M Na2CO3? Usi

Extraction, What is the principle underlying the extraction of metal

What is the principle underlying the extraction of metal

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