Standard Electrode reduction Potential - Electrochemistry, Chemistry, Class 12 Video Lecture

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about a standard electrode potential
standard electrode potential of a
galvanic cell so to understand it is an
electron potential of cell first
understand the standard electrode
potential of Hafsa because that is more
important and with that only you'll get
the standard electrode nature of the
whole set so to understand the standard
electric voltage with the hole to just
see this hassle just see this off so
let's suppose I am seeing this house
along so if you see this half cell focus
only on this half cell right CPC there
is an electrode here and there is an
electrolyte here is a electrolyte this
is my electrode in fact you see here
also we have electrode electrolyte we
are focusing only on this part right so
at this at each of this interface at
this interface and keyboard right there
is a tendency of metal ions from
solution to deposit on the model so
there is a tendency of copper plus in
the solution right to get to electrons
somewhere to get electrons from this
wire coming back right merge these form
a copper from copper and get deposited
right so copper plus nothing but copper
sulphide copper copper coins from the
copper sulfide is a tendency to form
copper in this case here they were
scenario there's a tendency of zinc from
this metal to become Jaden 2 plus and
give electrons correct so the tendency
here to become Jaden zinc iron from Jing
and here is a tendency to become copper
from copper 9 correct
so this tendency from copper plus to
become copper this gave its a positive
charge and this tendency from zinc to
gene class give it a negative charge
because zinc to zinc plus it will
liberate electrons and the regular
negative charge right so if you see for
a given half cell lon let's suppose the
equilibrium and there is a separation of
charge between electrode and electrolyte
right so the potential difference
between electrolyte and electrode is
called electrode potential please note
we are not talking about the potential
difference between these two electrodes
we are talking about the potential
difference between the electrode this
guy in the electrode right here
potential difference between electrode
and electrolyte for a given half cell
you're focusing only on one half cell
right this is called electrode potential
for that half cell right and since a two
lights is also involved so it depends on
the concentration of electrolytes also
matters concentration matters so
currently we will take only one molar
liquid we are talking about all the 1m
if it is a liquid will take about 1 mole
of liquid left right if it is a gas a
little I will take about 1 bar gas
pressure of you will talk about us and
repression all right so if you talk this
is the electrode potential at any
concentration but if you take everything
at STP
hey one more so at stp and one more this
this electrode potential which I just
got will become one standard electrode
rotation standard electrode potential
correct so we have something or
electrode foundation that is nothing but
the footage and if you electrodes and
the electro right for a given half cell
that is nothing but electrode potential
for that tough sell similarly if you
have take if this concentration can be
two moles three more skin any moles in
the temperature can be anything the
pressure can be anything but if you
standardize those values you just take
one em you take to 98 km temperature so
at that specific values right it has to
be whatever electrode potential
indicators that becomes a standard
electrode potential for that particular
half cell correct now when there is a
conversion actually see here we have our
having reduction here we are having
oxidation alright so again in if you say
standard electrode potential or
electrode potential are you referring to
reduction or are you referring to
oxidation we have to choose one else it
will be a confusion to be a cow house
actually when you solve problems one
will have negative sign will have
positive sign it'll all confusion so
what happened is to to avoid all the
confusion the IUPAC come came with the
convention it told that standard
reduction potential reduction potential
will be called electrode nature will be
called standard electric voltage
okay so it is a reduction now which
should be called as electrode potential
so for example for this I got some value
and just keep it as like that only
but for for this I got some value
whatever value I got some board write to
them but this I got x1 that is correct
because there is no reduction potential
here if I got oxidation potential as a
wide world then my electrode potential
will be - why water because flip it
because now we are saying that it's
always note here standard deduction
petition is the one which has become
electrode potential that is efficient
and to remember this rich people do
because if you see this rule is made by
rich people that iup IUPAC soulish is
what reduction these potentials the
reduction protection has become
electrical nature right so the rich
people has selected reduction potential
as the standard potential so to remember
if you want you can take it or you can
you can do it also so that is the point
I am trying to convey him so when I talk
about the reduction potential that does
become that has become electrode
potential now as power-ups in them and
that's again why I PSC has choosen we
don't know they just chose it and we
have to stick to it that is my standard
reduction potential or reduction
potential right so if you see my and
this manner and there's my cut off error
miss oxidation here we have an oxidation
catherine's reduction so and reduce half
cell in which oxidation takes place so
since now I have taken
electrode potential as the reduction
potential so this will have negative
potentials correct it will have negative
electrode rotation why see because this
will have always have positive oxidation
information because here oxidation is
happening so it will have positive
positive oxidation potential that means
it laughs negative reduction potential
now it has been accepted widely that
reduction rotation is my electrode
rotation so it will have negative
electrode rotation correct positive
oxidation potential implies negative
reduction potential implies negative
electrode potential so it will have
negative electrode prevention here in
this case positive reduction potential
because reduction is happening here so
that implies it will have positive
electrode rotation so hope you
understand what I'm trying to say now
since there is a confusion here new term
called electrode potential here
introduced and that is always the
reduction potential so in reduction huh
reduction is happening so reduction
potential is positive since reduction
potential is positive my electrode
potential will all is opposed in the
oxidation asks the oxidation have
oxidation potential to be positive that
means reduction boys table for potential
will be negative reduction potential is
negative that means electrode potential
will also be negative right now you see
there is a potential difference between
these two electrodes right the moment
you turn on the switch
a current will flow right the current
will flow from the electron will flow
from anode to cathode and the current
will flow in the reverse direction right
so this potential is called electrode
potential of cells so electrode
potential potential of cell is nothing
but e of
Catherine - yo
please don't why because he cathode we
have reduction right so gently this
isn't this isn't positive this is
positive so it will have a positive
value - this will have a negative L
overall you'll get positive I hope you
understand why we are taking capital -
anode because if you take another -
cathode it'll come negative - some
positive already come out to a negative
value so it will be usually you have to
say that my electrode protein is minus 7
point 1 volt for a battery doesn't look
good so again this is also by IEP see
this is what I UPC has given this that
electrode formation of a sellers II
cathode - yeah correct
so that is what we have learned in this
slide that my electrode protonation is
nothing but reduction today chill as per
IUPAC for a given half cell so the
electrode potential of a cell is nothing
but electrode potential of a cathode -
electrode potential of minot and please
know we talked about electrode potential
I'm talking about the reduction
potential don't take oxidation potential
here right because I'm talking about
electrode petition that is nothing but
reduction potential so we'd always take
reduction potation of early just to
avoid any confusion so as I told that
the potential difference between two
electrodes in a galvanic cell is called
cell potential right that is nothing but
electrode potential of my cat or -
electric potential this has positive
value this has negative value so
override comes out to be positive
correct and it is measured in volts and
I told Y it is visible to cut it in the
honor of Alexandra Voltas right so the
cell potential is the difference between
the electrode potential of or nothing
but this is nothing but the reduction
potential as a collimation
of cathode and anode please note it is
cathode - not another - quatre sorry
so it is this value is called
electro-motive force when there is a
conditioner so now this value will be
called EMF or electro-motive set of
electrometric force of the cell when no
current is please know this value is
called electro motive email when there
is no current for example in this case
not there's a current drawn right so
this is not email if you apply some
voltmeter here you won't get EMF but in
this case since there is no current that
is being used so whatever be you get it
becomes the EMF of the cell it's going
to say even the cell that means the cell
potential of the cell when there is no
current drawn from the cell right now
there was a conviction some people used
to keep around on the Left cathode on
the right some people used to do the
other way wrong some people used to
cathode on the left and on the right end
it was a confusion
so again IUPAC name came with the
convention that anode will be on the
left and cathode will be on the right
what memory tip is AC air-conditioned he
come first C come first
C come next right air-conditioned runs
on what electricity I mean the other
time is you get is C there is no link of
C and the currents agree you know that
he seen on the dissidents on electricity
so there is a link here and on the left
cathode on the right they this is a the
presentation actually a nerd always has
to be on the left and Catherine always
has to be enjoyed as per I implicit now
the Calormen Excel is represented by
putting vertical lines between the
metals and the electrolyte so example I
have metal they'll put a vertical line
put electrolyte this would be for the
anode and then that will be another
electrolyte for the cathode I'll put
double vertical line and put a little
line here there'll be another material
in the Phi it's a example will be metal
zinc here I have Jing sulphate and I
have electrolyte copper sulfate and then
I have metal copper so you see B is my
so you see ya I don't have jinkin zinc
sulfide zinc this is my doing some and
cathode I have copper and copper sulfate
loose function this will be present as
zinc solid and this will be completed in
two plus that is an a quest mode and
there is a double slash Cu 2 plus a
quest more in the copper salt so that is
the representation of a galvanic cell
and it become first and then cat
correct so this is a representation for
this daniel CELAC that is a type of
carnac's so using this convention let
suppose i have to find the email of the
self
right so even if the cell is always
positive so EMF in the cell will be one
of cathode - yeah
so you can also say he right - he left
right - that Hey right comes first right
always right is always first right right
- left right in the liar
helper liar right - left what is the
value of e right copper to copper plus e
reduction is 0.34 volt - for this for
this if you see jing to gym class the
oxidation p of oxidation of zinc to win
children to class is plus 0.76 good but
we are looking for G of reduction Oh
Jaden +2 Jaden correct that is nothing a
minus 0.76 Pole and this is nothing but
my he not purging correct that is
nothing was minus 0.76 would totally is
1.9 right so he right was my like a like
a mistake here II write was my new
copper two plus two copper - he left was
e Jaden + T - Jared please note here I
am NOT saying he of zinc - Jaden plus
because I'm talking about the
introduction here also a reduction from
Cu two plus two copper here's a
reduction tom zinc plus two teaching
because reduction is taken as efficient
electrode potential rich people - right
so with this I got one point one volt
that is my EMF of this cell now the
question is how did I find that
reduction potential of copper from Cu
two plus two C
is 0.34 volt and reduction potential of
Jane from German plus 2 J is 0.76 how
did I find that there has to be some
method to find it thank you
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