L37 : Hydrolysis of salt - Equilibrium, Class 11 Video Lecture

hello friends this video on equilibrium
bar 37 is brought to you by example calm
no more fear from exam before watching
the video please make sure that you have
watched all the previous parts now we'll
go through a very important topic called
hydrolysis of sod and pH of the soil so
what is hydrolysis see hydrolysis the
word severe hydro means water and lysis
means separation right that means
breaking of the chemical gone by water
so water separates stuff's got to break
the bond that is hydrolysis correct so
you put water into the sword the sword
breaks that is right the word hydrolyze
this water breaks things that means in
case of salt if you add salt in water
then you see that the salt is broken by
so the point there is the water is not
always the sweet water which we use
right water is sometimes heavy and that
is in hydrolyzes because in high places
water act as the agent which breaks salt
to observe that it is the sort of weak
acid or base or both then it dissolved
water it is converted into acid in base
will take some examples you have a sword
now big acid the big bees put in water
it converts into accident piece so for
this we one more fancy name called KH KH
means kill hydrolysis hydrolysis
constant that is nothing but
concentration of a sin by concentration
of base by concentration of salt water
is something which we know because it is
a liquid and it's concentration is
constant
all right so that's same logic which we
had for equilibrium same logic we apply
here
so the KH is nothing but concentration
of acid concentration of base by
concentration of salt and same thing we
had something called degree of this
here they are in the qiam here also we
have the fraction of total soil that is
hydrolyzed that equilibrium is part
degree of hydrolysis and it's denoted by
H so there it was an alpha here it is
that you do the same actually but
actually specifically got hydrolysis
equation for the extent in which the
sword is hydrolyzed is nothing but the
degree of equilibrium so we told the
salts are from weak acid bleep a strong
acid strong base combination how to find
that give me the salt how to find out so
it's take three different salts and
let's try to find whether they are
solved or weak acid we pay a strong acid
strong base for each combination
there's six here three units so if you
see ch3co assad if you break it there
are two ways actually one easier which i
did you see s3c ona just by looking at
this you can make out that this we have
form from CS 3 co h and in a village
okay this is a very weak acid you know
that and there's a very strong base so
you can say that this sword does form a
weak acid and strong base this is one
approach or their approaches you have CS
d co and you break it is you come ch3co
- and na+ and you also have h2o
we have seen that because in natural
solution will have n plus 2 oh you
should break into h plus Englishman's
now if you see on the right hand side
only what will have so we will have the
solution h plus h minus CH 3 Co - I know
that CH 3 Co H this as if we actually
know the CH 3 Co
and I say only very eat human be 2% or
3%
this was should disassociate other isn't
as that means here also if I put lot of
cscc oh oh mines and h plus the reaction
will go in this direction and it will
form CH 3 CH
so h plus ion concentration will be gone
from this solution correctly you got csv
co- and ashlars whenever they are they
always have tendency to form CH 3 Co H
it was a very big as a CSS viewers say
this is the very big acid it on cs3 cos
at the hypogeum iron Constitution will
be gone this thing is gone to the system
normal and instead of this we'll get cs3
see which so now what is remaining is na
plus innovation - so and they plus I
know I you mind you know that if you
have any wedge it becomes na+ and oh-
almost no anything percent so so if you
have any wedge it will try to become
manipulation and a+ anyways - if you
have any + + o h minus ions they will
never mix to become generous right
because it's the very strong base anyway
ok so in this solution the whole
solution will have lot of Oh H minus
ions current and we have a voice - and
polish it is basic this guy is a basic
salt so the question was with the middle
is solved with acidic or basic
the answer is busy so one option was
just use this logic and understand this
is a sort of weak acid or strong base so
here we found its strong he is being an
same stronger part of us basic so we
told it is a reason another option is to
understand the logic you write the
equation and this when you see that CSS
you - because it always combined upon
CSC cos this part is gone dumb system -
but this quantum system we have more of
a chocolate and cigarettes for steel and
edge of course here is going into and
it's for glass and steel - and again we
have h2o it will break into s plus and H
- so now if you see I have either X plus
CL minus and it's for watchman I know
that nh4 know H - when combined together
you know NH 4 or which is a very weak
acid form anise 4 + OS - very few you
need to person if you could NH 4 plus of
h - together it will form LSU converge
right so 19% is this into person is this
so you for - porridge - so this is
dipping it on the system system will
have more effects plus sign now because
there's CLE to talk about SCL it forms h
plus NC in - so here 99% is this and one
person in person so even if you put a
lot of X percent Ceylon as well in seal
- I
it won't combine to form a seal so we'll
have more of X plus ions so it will be
yesterday right also if you want what
you can do is you can say that nh4cl is
nothing but from from n s 3 and s CL HCl
is a strong acid and this is a weak base
right strong as it specially stronger as
it brought so it will be actually there
are two different ways you can use any
of these so with the same approach you
can find power ch3coo minus at this form
so ch3coo minus u minus q1 break into
ch3 see you - and NH 4 if you put h2o
into times S Plus innovations so here if
you see this then it also form and this
their gross form so it will be almost in
truth why because this is now let's talk
about the hydrolysis of salt we have
discussed the types of salt now and let
us understand the hydrolysis all because
the hydrolysis of salt
depends on the salt finally so if I have
sort of weak acid and strong base we
just discuss this
there were CSD Co name looks like this
or we have a sort of strong acid and
need-based Innes force here it looks
like this or we have a salt our weak
acid weak this example CSV CO and it's
put in all this case my hydrolysis
behaves in different field we will talk
about this and we'll try to derive the
relationship so let's understand this
because in all these cases the Hydra
license behaves in differently
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