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To Predict the Direction of Reaction Video Lecture - JEE
FAQs on To Predict the Direction of Reaction Video Lecture - JEE
| 1. How can I predict the direction of a reaction in JEE? |  |
Ans. To predict the direction of a reaction in JEE, you can use the concept of Gibbs free energy (ΔG). If ΔG is negative, it indicates a spontaneous reaction in the forward direction. On the other hand, if ΔG is positive, the reaction is non-spontaneous in the forward direction and will proceed in the reverse direction. If ΔG is zero, it suggests an equilibrium state where the reaction can occur in both the forward and reverse directions.
| 2. What factors affect the direction of a reaction in JEE? | |
Ans. Several factors can influence the direction of a reaction in JEE. These include the concentration of reactants and products, temperature, pressure, and the presence of catalysts. Changes in these factors can shift the equilibrium position and determine whether the reaction will proceed in the forward or reverse direction.
| 3. How does Le Chatelier's principle help in predicting the direction of a reaction in JEE? | |
Ans. Le Chatelier's principle states that when a system at equilibrium is subjected to a change, it tends to counteract that change and restore equilibrium. By applying this principle, you can predict the direction in which a reaction will shift when external conditions, such as temperature or pressure, are altered. For example, if the concentration of reactants is increased, the reaction will shift in the forward direction to consume the added reactants and restore equilibrium.
| 4. Can the direction of a reaction be predicted solely based on the stoichiometry of the chemical equation? | |
Ans. No, the direction of a reaction cannot be predicted solely based on the stoichiometry of the chemical equation. While the stoichiometry provides information about the ratio of reactants and products, it does not consider factors such as energy changes and equilibrium conditions. To predict the direction of a reaction, it is necessary to consider thermodynamic principles and equilibrium constants.
| 5. How does the concept of equilibrium help in predicting the direction of a reaction in JEE? | |
Ans. The concept of equilibrium plays a crucial role in predicting the direction of a reaction in JEE. At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, indicating a balance between reactants and products. By analyzing the equilibrium constant (K), which is the ratio of product concentrations to reactant concentrations at equilibrium, you can determine if the reaction will favor the forward or reverse direction. A large K value suggests a higher concentration of products, indicating a forward reaction, while a small K value suggests a higher concentration of reactants, indicating a reverse reaction.
Text Transcript from Video
hello friends this video on equilibrium
part 13 is brought you by example calm
no more fear from exam before watching
this video please make sure that you
have watched all the previous parts now
if I want to point the direction of
reaction whether the reaction will go on
the left hand side on the right hand
side
how will I fight now I have told you the
presentation that ok 80% 70% lady person
other reactants will react to form
correct but the question is what are the
direction whether the reactants
because sometimes I like to work example
I have a plus B is equal to C plastic
reaction here and if I give let suppose
X mole of the survival of the Z bull
exists and p1 of this now I'm not sure
that if I start with these concentration
whether the reaction will go forward
Direction backward direction I don't
know because it all depends on the
initial concentration right on a b and c
and d sorry that is something I don't
know so how to find the ratio of
reaction so this we can do if we know
something called reaction quotient so
for this we have to find something
called reaction quotient and then by
comparing this reaction quotient with my
K I can find the direction of the
reaction so what is reaction quotient so
we actually was similar to my aquarium
constant example equally positive was
something which we find that equilibrium
but reaction quotient is nothing but
similar thing but it did not be the
clear image it is at any point you want
to find generally this is fine we
generally find this as T's equal to 0
generally but there's not that you have
to find it t is going to 0 if you find
it t is equal to once again using index
but jelly see when you talk about
equilibrium constant we tell that we
have to find what the concentration of
the product to the powerstroke metric
avec coefficient by concentration of
reaction to the powerstroke event
culture
equilibrium they'll be specified that
you have to find least under equilibrium
phase you keep some reactants ad and
then let it form products and then after
they could have reached you find the
concentrations of all this value and
then we find the KCl right please that
means you talk about it KC at
equilibrium you don't calculate this KC
is equal to 0 it is been wanting to you
don't care you calculate this value only
at T is equal to but I want to find this
value any point then that value is not
KC because this is constant that value
is called the reaction quotient and
generally it is found at the initial
level initial for example I have this
reaction and find the reaction cooking
here and I'll compare with a k and then
I have various formulas here if my QC is
greater than K see the reaction will
proceed in the direction of the reactant
that is reverse reaction if my QC is
less than K see it is forward reaction
and if my QC is going to kiss that means
my equation on my the whole system is
already clean please note if QC is
greater than K C right it will be in the
reverse directions logically if you
don't want to remember this let's see
this Hugh sees one my products
concentration my reactants right so it
might throw that's our move see if QC is
greater in case we integrate this is
greater than k CN is giving that means I
product sum or see this QC can greater
than that means this product is more
than what it should happen in
equilibrium right
this is currently 90 so product at that
particular time T at that particular
time is greater than the product at
equilibrium right because KC is what
Casey's word case is nothing but product
at equilibrium concentration the past
coefficient by reactant concentration at
equilibrium so if this is greater than
means product is more it QC can be more
only when the product
the product concentration is more
obviously some of the product will be
used in the backward direction create
some reactants it's if I the pumping
more products here what will happen the
reaction will simply the same type so if
my QC is more that means my product is
work if my product is more if you
company more and more products here the
reaction will move backward direction QC
is less that means my product is less
and the example is reactants are more if
you pump them more and more and more
reactants here the reaction will move in
the computation and does the reaction
moves in the formulation and if QC is
equal to KC that it is very very simple
hope you understand see even if you
don't know need to learn this this
understand the concepts you see is
nothing but my concentrations of the
product and reactant at any time T so if
Q C is greater than K C that means my
product concentration there's more at
that particular time if you compare if
the product concentration equilibrium so
if your product concentration is more
that means my Librium will move in the
backward direction to make sure the
product is less right same thing if QC
is less than K C that means my product
is this if I product is less you move
product that you can do by reacting
reactants that means my reaction is
value that will take some examples I
will predict the direction of the
equilibrium so the question says the
value of KC for this reaction where to a
is in 1800 billion see the kc value
something but 2 into 10 to the power
minus and a given time at some time T is
equal to T in washer or T is equal to
capital T some line the reaction mixture
is the concentration very efficient is a
concept in is equal to V is equal to C
and the concentration is 3 into 10 to
power minus 4 more molarity let's see in
Papua 10 to the power minus 4 moles per
liter so we have to find the direction
of the reaction so Q is what Q is what
circulation of me concentration of c by
concentration of a square at time T so
at time T correct so what is the
concentration at time B at time T same
what is the concentration of C a time T
same three leave our minds what is the
conservation of a at time T 3 into 10 to
the power minus the part we saw this
comes out to be 1 so my Q is equal to 1
and K C is what KC is 2 into 10 to the
power minus 3 so which one is more
obviously Q is much much bigger than T
is much bigger than K so if Q is bigger
than KC now what will happen the
reaction will go in reverse direction
right Q is bigger that means my products
are more if my products are more that
means Q is bigger that implies products
more product exists and if more product
exists the way and the equilibrium will
go in the reverse direction correct easy
one let's ignore example a mixture of
1.57 mol of nitrogen 1.9 - mole of
hydrogen 8.1 three more of Amiens
introduce new 22 they actually make a
please no 20 literature when the volume
is a little sewing circle this at 500
Kelvin at this temperature equilibrium
constant for this reaction is 1.7
million per month take the bar - is this
we actually if you get yes for me see if
reaction is an equilibrium or not we can
tell me and you can find the value of Q
and if Q C is equal to KC the pins my
reaction liquid so let's find a virtue
so my reaction is in plus h2 gives
so my Q is nothing but concentration of
illness 3d cartoon by concentration of
any concentration of ished regard three
at t is equal to everything at T is
going to be some time what T is equal to
zero you can see because we are starting
only enough now at this time what is the
value of n s3 and s3 was eight point one
three mole per twenty leader right so
8.13 by twenty key god what is n2
concentration one point five is seven
volts per twenty meter
goodbye 20 what is the h2 concentration
one point nine two moles well but liter
is important right so if you solve this
comes out to be two point three eight
included in the bar let's compare this
value with KC KC KC is one point seven
independent water are they same no they
are not same you see is greater than
please great QC is greater than K C that
means my products more at T is equal to
zero that means if my products are more
the reaction will go in backward
direction I hope you understand see I
found a rather of QC and the QC s value
is not equal to ki that means the
reaction is not anything the next
question is which direction it will go
so you see QC was greater than k c QC is
greater than k c that means the products
are more at t is equal to 0 then what it
should be able to compare the value of
product at equilibrium that means
reaction in the magnetized thank you
visit exam fair calm - watch free
education videos try free online tests
get the best quality study materials
study from the best tutors and
and much more thanks again
part 13 is brought you by example calm
no more fear from exam before watching
this video please make sure that you
have watched all the previous parts now
if I want to point the direction of
reaction whether the reaction will go on
the left hand side on the right hand
side
how will I fight now I have told you the
presentation that ok 80% 70% lady person
other reactants will react to form
correct but the question is what are the
direction whether the reactants
because sometimes I like to work example
I have a plus B is equal to C plastic
reaction here and if I give let suppose
X mole of the survival of the Z bull
exists and p1 of this now I'm not sure
that if I start with these concentration
whether the reaction will go forward
Direction backward direction I don't
know because it all depends on the
initial concentration right on a b and c
and d sorry that is something I don't
know so how to find the ratio of
reaction so this we can do if we know
something called reaction quotient so
for this we have to find something
called reaction quotient and then by
comparing this reaction quotient with my
K I can find the direction of the
reaction so what is reaction quotient so
we actually was similar to my aquarium
constant example equally positive was
something which we find that equilibrium
but reaction quotient is nothing but
similar thing but it did not be the
clear image it is at any point you want
to find generally this is fine we
generally find this as T's equal to 0
generally but there's not that you have
to find it t is going to 0 if you find
it t is equal to once again using index
but jelly see when you talk about
equilibrium constant we tell that we
have to find what the concentration of
the product to the powerstroke metric
avec coefficient by concentration of
reaction to the powerstroke event
culture
equilibrium they'll be specified that
you have to find least under equilibrium
phase you keep some reactants ad and
then let it form products and then after
they could have reached you find the
concentrations of all this value and
then we find the KCl right please that
means you talk about it KC at
equilibrium you don't calculate this KC
is equal to 0 it is been wanting to you
don't care you calculate this value only
at T is equal to but I want to find this
value any point then that value is not
KC because this is constant that value
is called the reaction quotient and
generally it is found at the initial
level initial for example I have this
reaction and find the reaction cooking
here and I'll compare with a k and then
I have various formulas here if my QC is
greater than K see the reaction will
proceed in the direction of the reactant
that is reverse reaction if my QC is
less than K see it is forward reaction
and if my QC is going to kiss that means
my equation on my the whole system is
already clean please note if QC is
greater than K C right it will be in the
reverse directions logically if you
don't want to remember this let's see
this Hugh sees one my products
concentration my reactants right so it
might throw that's our move see if QC is
greater in case we integrate this is
greater than k CN is giving that means I
product sum or see this QC can greater
than that means this product is more
than what it should happen in
equilibrium right
this is currently 90 so product at that
particular time T at that particular
time is greater than the product at
equilibrium right because KC is what
Casey's word case is nothing but product
at equilibrium concentration the past
coefficient by reactant concentration at
equilibrium so if this is greater than
means product is more it QC can be more
only when the product
the product concentration is more
obviously some of the product will be
used in the backward direction create
some reactants it's if I the pumping
more products here what will happen the
reaction will simply the same type so if
my QC is more that means my product is
work if my product is more if you
company more and more products here the
reaction will move backward direction QC
is less that means my product is less
and the example is reactants are more if
you pump them more and more and more
reactants here the reaction will move in
the computation and does the reaction
moves in the formulation and if QC is
equal to KC that it is very very simple
hope you understand see even if you
don't know need to learn this this
understand the concepts you see is
nothing but my concentrations of the
product and reactant at any time T so if
Q C is greater than K C that means my
product concentration there's more at
that particular time if you compare if
the product concentration equilibrium so
if your product concentration is more
that means my Librium will move in the
backward direction to make sure the
product is less right same thing if QC
is less than K C that means my product
is this if I product is less you move
product that you can do by reacting
reactants that means my reaction is
value that will take some examples I
will predict the direction of the
equilibrium so the question says the
value of KC for this reaction where to a
is in 1800 billion see the kc value
something but 2 into 10 to the power
minus and a given time at some time T is
equal to T in washer or T is equal to
capital T some line the reaction mixture
is the concentration very efficient is a
concept in is equal to V is equal to C
and the concentration is 3 into 10 to
power minus 4 more molarity let's see in
Papua 10 to the power minus 4 moles per
liter so we have to find the direction
of the reaction so Q is what Q is what
circulation of me concentration of c by
concentration of a square at time T so
at time T correct so what is the
concentration at time B at time T same
what is the concentration of C a time T
same three leave our minds what is the
conservation of a at time T 3 into 10 to
the power minus the part we saw this
comes out to be 1 so my Q is equal to 1
and K C is what KC is 2 into 10 to the
power minus 3 so which one is more
obviously Q is much much bigger than T
is much bigger than K so if Q is bigger
than KC now what will happen the
reaction will go in reverse direction
right Q is bigger that means my products
are more if my products are more that
means Q is bigger that implies products
more product exists and if more product
exists the way and the equilibrium will
go in the reverse direction correct easy
one let's ignore example a mixture of
1.57 mol of nitrogen 1.9 - mole of
hydrogen 8.1 three more of Amiens
introduce new 22 they actually make a
please no 20 literature when the volume
is a little sewing circle this at 500
Kelvin at this temperature equilibrium
constant for this reaction is 1.7
million per month take the bar - is this
we actually if you get yes for me see if
reaction is an equilibrium or not we can
tell me and you can find the value of Q
and if Q C is equal to KC the pins my
reaction liquid so let's find a virtue
so my reaction is in plus h2 gives
so my Q is nothing but concentration of
illness 3d cartoon by concentration of
any concentration of ished regard three
at t is equal to everything at T is
going to be some time what T is equal to
zero you can see because we are starting
only enough now at this time what is the
value of n s3 and s3 was eight point one
three mole per twenty leader right so
8.13 by twenty key god what is n2
concentration one point five is seven
volts per twenty meter
goodbye 20 what is the h2 concentration
one point nine two moles well but liter
is important right so if you solve this
comes out to be two point three eight
included in the bar let's compare this
value with KC KC KC is one point seven
independent water are they same no they
are not same you see is greater than
please great QC is greater than K C that
means my products more at T is equal to
zero that means if my products are more
the reaction will go in backward
direction I hope you understand see I
found a rather of QC and the QC s value
is not equal to ki that means the
reaction is not anything the next
question is which direction it will go
so you see QC was greater than k c QC is
greater than k c that means the products
are more at t is equal to 0 then what it
should be able to compare the value of
product at equilibrium that means
reaction in the magnetized thank you
visit exam fair calm - watch free
education videos try free online tests
get the best quality study materials
study from the best tutors and
and much more thanks again
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Oct 11, 2025
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