I gratefully acknowledge the pride of having worked under the dynamic of benevolent invaluable supervision of Mrs. Manju Gupta, head of Chemistry Department Simpkins School, Agra. His instructive criticism and encouragement make me to present the project.
I am indebted to Mr. Saurabh Sinha, Simpkins School, Agra for the excellent working facilities that was made available to me for this project.
SANDEEP KUMAR SINGH XII-A
CERTIFICATE This is to certify that Ms. Sandeep Kumar Singh of Class XII A of Simpkins School, Agra, has completed her project file under my supervision. She has taken proper care and shown utmost sincerity in completion of this project.
I certify that this project is upto my expectation and as per the guidelines issued by CBSE.
Mrs. Manju Gupta Chemistry Teacher
Signature
INDEX
INTRODUCTION
MATERIAL REQUIRED
MECHANISM
CIRCUIT DIAGRAM
PROCEDURE
RESULT
BIBLIOGRAPHY
MATERIAL REQUIRED 1. Zinc block 2. Copper strip 3. Copper Sulphate Solution 4. Battery 5. Beaker 6. Two wires
INTRODUCTION is a process of
ELECTROPLATING
depositing a coating of one metal over another by passing current electroplating can be used for decorative purposes.
EXAMPLES
Aluminium
objects
look
more attractive when electroplated with nickel. Silver gold metals are electroplated on objects made of cheaper metals to make
them
Electroplating
look
more
protects
attractive.
metals
from
corrosions as well as weather. Zinc articles are electroplated with copper to protect them from corrosion.
ELECROPLATING OF A ZINC BLOCK WITH COPPER PROCEDURE The apparatus used for electroplating is shown in figure. Here, zinc block is to be electroplated; electrode
so
it
(cathode)
is is
made
negative
connected
to
positive terminal of the battery. Copper sulphate solution is taken as electrolyte.
Since copper sulphate consist of copper ions (Cu2+) & sulphate ions (SO42-) , when current is passed following reaction takes place…..
MECHANISM It is based on the relativities of metals. Less reactive metals are electroplated on lower position in the reactivity series. In other words
we can say that metals having higher position ion relatives series are to be electroplated with metal having lower positions.
AT ANODE The copper atoms lose two electrons & get reduced to copper ions (CU 2+), which goes into the copper sulphate solution.
Cu-2e-
Cu2+
(Copper from anode)
(Copper ions go
into solution)
The
metal
article
on
which
electroplating is to be done is made cathode
and
connected
to
negative
terminal of the battery. The metal to be deposited is made anode and connected to positive terminal of the battery.
A water-soluble salt of metal to be deposited is teken as electrolyte.
AT CATHODE Positively charged copper ions (Cu2+) go to the cathode where they accept electrons & get reduced copper (Cu) these atoms get deposited on the zinc block.
Cu2+ (Copper
Solution)
+
2e-
Cu
ions from Copper Sulphate
RESULT A bright and shining layer of copper is formed on the zinc block & we can say that zinc is copper-plated. The concentration of electrolyte remains same sulphate ions not get discharged because they have high discharge potentials.
