Video: Raoult's Law as a Special Case of Henry's Law Video Lecture - NEET

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some people say in fact we see that
rolls law is a station keys of Henry law
what I meant to say is it all it all is
bigger law the old law has a broad range
it covers lot of aspect henry law is
just a small aspect floors law that's
what you're trying to pull here so let's
start with what rolls or say the outlaws
say is that the idea
pressure of a solute let's suppose I
have a solid in solvent this is my
solute and is my solid okay
separation of a solute will be what mole
fraction of a solute into pressure of
solute in the pure phase that is this
guy right similarly pressure due to this
solvent the blue one is p2 breathing but
the mole fraction of solvent in the
solution phase into pressure due to
solvent in the purest that is what the
rod losses let's see what Henry losses
Henry law is do different Henry laws say
that the total pressure P total that is
nothing but pressure of solute plus
pressure of solvent is nothing but more
traction of solute into K H that is what
the henry tosses
correct and Henry law is only for gas in
liquid all dog is for liquid in liquid
gas and liquid what many scenarios so
the more general form general love right
but notice one thing in case of Henry
Lord is always X salute this is always X
saluted but in case of rolls law if you
want to find the partial pressure base
for solvent this ik solving if you want
to find the partial pressure of a solute
to use X solute why have you ever
wondered the reason is the Henry law is
only for the gas liquid solution so only
for gas liquid solution it is also for
gas gas liquid liquid what I am saying
is if the volatile component is so
volatile that it exists as gas then we
can apply Hinda law and please note this
is not true for all one good example
where i say that royal snow is the
special case of honey loyals and it
dissolved carbon dioxide in water so in
this case its suppose I am dissolving
carbonizing water so my solute is what
carbon dioxyde solid is what solvent is
what water correct so let me put
discovered I said here whatever soapy
totally power pressure due to carbon
dioxide
why should we do water and this will be
carbon exit correct now my was the the
car the carbon tax it is variable time
my carbon dioxide is very volatile as
compared to water water is not that word
so in this scenario what will happen
I'll just show you so in this not only
in this scenario where my solute is very
volatile or one of the competence very
power or solute is exactly solute is
very volatile this this happens only
when my solute is very volatile so may
think that in this case what will happen
in solid is very volatile and the
solvent is not very good at I'll so
pressured you to solvent will almost
become zero correct this is almost
become zero
why because water will not exert much
pressure so if you add these two for
example if I say this is equation 1 this
is equation 2 if you add these equation
now right what will happen this whole
thing is 0 my this is 0 my router's law
or henry's law become duration due to
carbon dioxide is nothing but X mole
fraction of carbon lies in Luke H so if
we compare equation 1 with equation 3
not equation 1 and equation 3 so
equation 1 is pressure due to solute
that is pressure due to carbon dioxide
is or let me not see carbon dioxide is
the only solid pressure due to solid is
X solute into P not solute here this is
pressure due to solute is X or loot into
KH so if you compare these two are the
only term that is different in these two
equations other things are all exactly
same right because these is gone if this
is gone you see this is pressure solute
pressure this is x value but these two
are different but if you know these your
constant values KH also is a constant
value and P naught solid is also
constant valuable example for carbon
dies if you can have a common constant
value because this is nothing but
partial pressure of carbon dioxide in
the pure carbon dioxide
um this is constant is also gone
as you can see that routes law I mean
Henry law is a special case of cross law
and my solute is very volatile and
solvent is non-volatile right so in this
case my Henry law is this becomes a
special case of God so our law is a
broader law covers more aspect
Henry law is only for gas and liquid but
third law is for other scenarios also
it's a bigger law it's a better lock
it's a better law it covers more aspects
right so this hope you understand and
please note this is true only this
analogy of example you take a glass of
water and you in that you put some
sodium chloride then in that gives you
you won't be able to say that Henry laws
is a special case of all law because in
that case it won't match right this is
matching only when my solute it is
dissolving in this case carbon dice it
is very volatile and solvent is non very
late
correct don't get them used actually all
law and Henry law two different laws
right but only one special case where
the solute is very volatile em solvent
is non-volatile they are they almost
similar thus we say role law is a
special case of Henry law that's why I
say a special case correct thank you
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