Solubility and solubility product - Ionic Equilibrium Video Lecture | Physical Chemistry

hello friends this video an equilibrium
part 43 is Marty by exam clear calm
nobody from exam before watching the
video please make sure that you have
watched all the previous parts let's
talk about new topic on solubility
equilibrium what is solubility really so
you must observe some ionic solids like
cats and chloride they are very much
soluble in water well some for example
lithium chloride are almost insoluble
what is the reason why some of the ionic
solids a soluble why someone's not
spoiling us on eBay right so the solid
depends upon the lattice in Kanchi of
the salt the solid raishin enthalpy of
the ions in the solution these two
factors on which the solid it depends
example EBC NaCl the salt it dissolves
easily embody a zebra right does not
dissolve in water so what this dissolved
water if you want it right so the strong
force of attraction between these na in
seal or calcium chloride it has to be
overcome by ions solvent interaction for
example the solvent is water here so h+
us this is minus partial negative charge
and it last CL minus this attraction ne
plus 0 minus attraction that the lattice
enthalpy attraction this has to be
broken by the ion solvent last example h
and the CL minus na notice this
interaction should overcome the lattice
the lattice attachment right right so in
these are known non-polar solvent the
solvation income is small engines not
sufficient to overcome this is for polar
solvent if you see in our since it can
dissolve nonpolar so learned you don't
get resolved because this factor is
right and the solubility also depends on
the temperature so example you have
water and you have put some sugar in
this
you heat it increase temperature more
and more so
once actually a cool down you see that
sugar crystals become a Cho solubility
also different something which I see if
you see there's a category here in the
solubility is more than point 1 M we
call that a soluble solubility is less
than 0.1 m but greater than point zero
madam because it's slightly soluble and
the solubility comes out to be less than
point zero one M we say it sparingly
solid is always inside so we'll take one
dumb example here VI so for if you see
if the saturated solution becomes V 8 +
+ S 4 - you put this in water it gives
then iums and ands and sulphate ions so
KSP will reward nothing but
concentration of this into consideration
of this solid so you can ignore that so
so KSP will be concentration of barium
into concentration of as a bonus
alright so again KSP is again a fanzine
our terms here nothing but the
solubility product or solid product
constant and the shark which has
solubility product for a lot of chemical
compounds at a given temperature
so if you see silver bromide this oily
product is five point zero 10 to power
minus 3 for calcium sulfate is nine
point one you know l6 let's table for
reference vending an example of solving
T product so we have to find solubility
product of a to make stream water as we
need that be the kind of ions react with
water so I have e 2 X 3 it will form to
18 + 3 X it will have charge free and I
still have charged a correct so let us
assume that this guy at t is equal to 0
at X number of hours and T is equal to
equilibrium
s soluble here so this is equals to s
three years cks is what
as I told will be nothing but
concentration of a three square and X -
okay this will be what and this value is
given 1.1 10 - 4 - but if you put the
value this becomes a 3 plus s 1 2 s
Square and X 2 - is three years Q this
is one point one 10 to the power minus
one you saw this you get SS check the
power five multiple - Phi M that's posed
for it so you get assessed 10 to the
power minus 5 so because you can see
that it is less soluble right we have
chart s has to be greater than 0.1 m it
is very soluble less than point less
than point 1 M and K to the point 0 1
I'm almost say me soluble and less the
points or whatever it's it's always in
so this is very very less I would write
the value of KSP of two sparingly sorts
this and this are given so we have to
say which salt is more solid so we have
to say which sort is more soluble we
have to just find s correct so let's
suppose I have this reaction ni o h2 it
will break into ni 2 plus and H - right
so let's assume this is s1 as a
solubility for this so this will be come
in at equilibrium this will become key
or some X minus s 1 this is s 1 s 2 s 1
correct rewind the KSP is what is going
to go s 1 square right any plus
concentration to push my as panel meter
square and this value is given
tune into 10 to the power minus 5 if you
solve the value you get S&S 5.8 10 to
the power minus this is what let's do 4
s 2 not the same mother reaction is ABC
n generally give you AG + + CN - so
let's assume this was X and the
solubility is s 2 here this become X
minus s to the 0 s 2 in 3 times s 2 H so
he s to believe what comes the pressure
of eg plus this is s 2 if you see a
minus s 2 and this value is 6 into 10 to
the power minus 7 you solve the value of
s 2 s 2 comes out to be 7 point 8
obviously CBC s 1 is greater than s 2
right since s 1 is greater than s 2 you
can say that my this guy is more soluble
right so I can see that this is more so
now let us stand the common ion effect
on solubility of ionic salts we have
seen the ion effects in the reactions of
the hydrolysis mobility ion affect the
solubility same thing here if you resign
concentration of one eye on that I am
combined with the ion of opposite charge
and the salt will be less period till
you get K s is equal to the QSB in the
aquarium is this balance and will try to
reach equilibrium rate will be explained
similar thing here explained right so
also if you are increase the iron it if
you decrease ion more solder bridges all
right so it's very simple if you
increase the ions salt will you receive
it out if you decrease the ion salt it
will dissolve for example I'll tell you
here so if you have NaCl gives
na plus n skaters so we increase the ion
of any class what will happen the stress
of this will be
overcome by force in this reaction in
the resolution right reverse direction
so NaCl will cover if you increase if
you so if you decrease the concentration
of NaCl the stress will be removed by
posting there are they quiver them in
this direction that means more and more
salt will be dissolve and if you
increase if you increase the NA plus
what happens if you release it in the
left hand side and in a simple comfort
of the social kind computer science see
if you increase this equilibrium will
move in this direction and they say will
come up if you decrease this equation
move in this direction in more and more
sword will be you saw right so a
critical example so I have a saturated
solution of NaCl and I pass a C and gas
so if I pass H plus HCl gas to it now
you see sodium chloride is precipitated
the NAC is present because the increased
concentration of CL minus 1 because we
are passing a CL as seen with what you
need we break each possessing my hand so
you're increasing the CL - iron here
right you are adding more steel - ah
since you are adding more Sigma's I'm
here but happiness make you believe will
move in this direction and NEC will come
so many here also same thing if you pass
as Syria's here so they're silk as we
leave you more cl- ions see a minus sign
increase concentration increases they
clearing moves in the left side you see
an SPD now you must be confused we have
discuss lot of times we discussed
k we discuss KW we discussed k a.kb
KSP what are these terms we discuss on
this right so here was the my normal
solubility constant equilibrium constant
JW was my shade of blue was nothing but
wine it's plus ions and Oh H minus ion
concentration we must send for - pudding
right taa was the same thing for the
acid so if I have an acidic reaction and
suppose I have a CL it forms
- okay a is nothing but my h+
concentration see here - consultation
right
similarly kb was my best example i have
a language it in equilibrium it's a
title to one let's suppose who takes
into any class once - in that case let's
take a big piece actually that's the NS
tree it dissolves in water
that's one you can say that katie will
be what and there's four plus
concentration of h minus concentration
is C and KSP is nothing but my
solubility so if I have let's suppose
NaCl and has also brought a little bit
and it doesn't see and - ESP is an amide
concentration and then it was in the
concentration of C all you get got from
here only but there are different fancy
terms heat key wkd ESP right thank you
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