Process of Electroplating - Chemical Effects of Current, Science, Class 8 Video Lecture

hello friends this video on chemical
effects of current part 11 is brought to
you by exam fee or calm no more fear
from exam cases now let us try to see
how exactly the process of
electroplating takes place how exactly
we provide a coating of one metal over
another metal so let us take the same
setup where we have two electrodes in
this case we have taken both the
electrodes made up of copper so both of
them are made up of offered and the
electrolyte which is used here is copper
sulphate that is cuso4 that is copper
sulphate and both the plates are made up
of copper and this is connected to a
battery right now when you dip the
electrodes into the copper sulphate
solution the circuit gets completed
because copper sulphate is a good
conductor so current will start flowing
through the copper sulphate solution now
as the circuit is completed current
flows now we have to allow the current
to flow for quite some time now we
before also in the potato experiment we
saw that right the greenish spot
appeared only after a couple of minutes
because the reaction which takes place
in the solution that will also take some
time to show its effects so just dip it
dip the electrodes into the solution and
allow the current to flow for quite some
time around fifteen to twenty minutes
after that remove the electrodes so take
the electrodes out of copper sulphate
solution and what do you observe the
observation is that copper gets
deposited on the electrode which is
connected to the negative terminal of
the battery so this is the negative
terminal of battery this is the positive
terminal of battery so on this electrode
we see that copper gets deposited so it
was just a copper plate on top of that
all copper has got deposited on this
electrode so what do you learn from this
we learn that using such a setup what we
can do is one metal
to deposit on the other middle now here
we have taken both as corporate rates
now instead of corporate if you would
have taken say a carbon rod here
so in that case copper would have
deposited on the carbon rod so basically
you are getting a coating of copper over
carbon similarly if you want the coating
of copper or some other metal just take
just instead of this copper plate you
put that particular metal so at the end
of this process you will get a layer of
copper on this plate so this is how we
can do electroplating now the question
is how exactly copper is getting
deposited on this plane however from
there is this copper coming now let us
try to understand that process now when
we link current passes through this
solution now as soon as these electrodes
are dipped into the solution the circuit
gets completed
the electric current passes through
copper sulphate solution
now when electrical current passes
through it this copper sulfate it
dissociates dissociates that is it
breaks into the respective ions and what
are the respective ions copper ions and
sulfate ions so as you can see copper
ions are positively charged and sulfate
ions are negatively charged right so
these copper ions being positively
charged they tend to move towards the
negative electrode which is the negative
electrode this is the negative electrode
and this is the positive electrode so
these copper ions will tend to move
towards the negative electrode so these
copper ions will start to deposit on the
negative electrode so what will happen
then so copper is getting deposited on
this electrode but at the same time this
copper sulphate solution is losing the
copper ions so the copper sulphate
solution also needs copper ions so from
where is the copper ion coming that
copper end is coming from the positive
electrode so what is HAP
at the positive electrode from the
positive electrode the corporate so this
electrode is also made up of copper so
the coracoid breaks becomes copper ions
by losing two electrons and these copper
ions from the positive electrode comes
into the cell copper sulphate solution
so basically what is happening is from
the copper sulphate solution to copper
ions are going into the negative
electrode and copper ions are coming
from the positive electrode and that is
how the copper sulfate solution is being
balanced
so basically copper sulfate solution is
always there just that this copper ions
are going from solution to negative
electrode and copper ions are coming
from positive electrode to the copper
separate solution so if you look at the
overall process the net result is that
coopera ins are being transferred from
the positive electrode to the negative
electrode through the solution so that
is what is happening net process if you
see copper ions I think transferred from
positive electrode to negative electrode
so now let us suppose that you have to
do an electroplating so say this is
corporate plate so whichever letter you
want to put a coating like suppose you
want to put a coating of zinc on iron so
in that case you should keep iron on the
negative iron should be the negative
electrode and the zinc should be the
positive electrode because form positive
electrode zinc will come out and it will
go to the negative electrode and that is
how you will gain as being coding so
very well on whichever metals whole
thing you want to give that metal should
be the positive plate and on which metal
you want to give the coating that metal
should be the negative plate for example
instead of copper plate this could be a
carbon rod so if this is a carbon rod
what will happen
the process there will be a plating of
copper on the carbide rod so that would
be the net result so basically in the
process of electroplating what happens
is the metal which is on the positive
plate that will go and get deposited on
the negative plate that is the net
result so you have to remember that and
accordingly you have to decide that
which method should form the positive
electrode and which metal should form
the negative electrode so I hope you
have understood the process of
electroplating and you saw how
advantageous it could be in a lot of
things thank you
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