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Polybasic Acids & polyacidic Base - Equilibrium Video Lecture - Class 11
FAQs on Polybasic Acids & polyacidic Base - Equilibrium Video Lecture - Class 11
| 1. What are polybasic acids and polyacidic bases? |  |
Ans. Polybasic acids are acids that contain more than one ionizable hydrogen atom, meaning they can donate multiple hydrogen ions (H+). Polyacidic bases, on the other hand, are bases that can accept multiple hydrogen ions. Both polybasic acids and polyacidic bases can form multiple acid-base equilibria.
| 2. How do polybasic acids reach equilibrium? | |
Ans. Polybasic acids reach equilibrium by donating one or more of their ionizable hydrogen atoms to a base. The extent of ionization depends on factors such as the concentration of the acid, the concentration of the base, and the strength of the acid. At equilibrium, the acid and its conjugate base coexist in a balanced state.
| 3. Can you provide an example of a polybasic acid? | |
Ans. Sulfuric acid (H2SO4) is an example of a polybasic acid. It contains two ionizable hydrogen atoms, which can be donated to a base. When sulfuric acid donates one hydrogen ion, it forms the bisulfate ion (HSO4-), and when it donates both hydrogen ions, it forms the sulfate ion (SO42-).
| 4. Give an example of a polyacidic base. | |
Ans. Sodium hydroxide (NaOH) is an example of a polyacidic base. It can accept multiple hydrogen ions from an acid. When sodium hydroxide accepts one hydrogen ion, it forms the hydroxide ion (OH-). If it accepts another hydrogen ion, it forms the water molecule (H2O).
| 5. How does the equilibrium of polybasic acids and polyacidic bases affect pH? | |
Ans. The equilibrium of polybasic acids and polyacidic bases can affect pH. When a polybasic acid donates its hydrogen ions, it increases the concentration of hydronium ions (H3O+), leading to a decrease in pH. Conversely, when a polyacidic base accepts hydrogen ions, it decreases the concentration of hydronium ions, resulting in an increase in pH. The equilibrium position determines the relative concentrations of hydronium ions and affects the overall pH of the solution.
Text Transcript from Video
hello friends this video an equilibrium
part 33 is brought you by example calm
no more free from exam before watching
the video please make sure that you have
watched all the previous parts now I
will take Poli basic acid and poly PC as
the base so what are these poly basic
acid body is English so if you see
something like s 2 s 4 I'll tell you it
has more than one so not so acid which
have more than one ionizer will protons
per molecule are called poly basically
as example in this case s 2 as a poor
you will first give you H person in a
simple manner and this hso4 minus ion in
again here h plus n is a promised to
enter right so in both case k will be
differently force to be k1 and then we
became the general example x2 x give you
h plus and expand HX 1 sign the k this
value that is h plus mu h x- by h 2 X
again this a chicks - from here you'll
be equilibrium with H plus and X minus 2
- I'll get a different kilos so again to
case K 1 and K right so the that process
different in quality DCT assets or
polyprotic acids again I nice even so I
get two different values of ki ki 1 and
cables that sound difference here right
and kill u 1 and K 2 whole power first
and second item on so there are two
constants for see if it is three example
I think is 3 3 or 4 it has 3 ni Shubin
for Dom so it will have k1 k2 k3 its
first intern - constant for this yes
this is a table for this if you see for
example if you see the phosphoric acid
if you see they are 3 K k1 k2 in 83
suffering acid
he won killing oxalic acid he even so he
can have K 1 K 2 or K 1 e 2 gauge
depending on the number of I another one
look of it has a please note if you see
the higher I order a nation percent are
smaller in the lower order einige
muscled-up
bigger so you see these value will be
more actually unless why you see the
next ionization will not happen so easy
example h2so4 gives X plus minus and
then minus X plus if you see this is
this will easily give 1 dash plus but
next express is difficult to get right
because already it has lost 1 dash plus
so this reaction will happen less in the
forward reaction and this the k-8 to
Adam this is a 1 it is a a k-8 value
will be lesser than k1 because this
reaction will happen more more in the
formulation this will have any less than
poverty
so the question says the first
ionization constant of h2s is 9 point 1
10 to power minus 8 so I have something
on s2 gas it gives as + + HS - and for
the skate a 1 is 9 point 1 21 - right
second ionization constant or this is 1
point 10 to power minus 13 you need to
qualify the concentration of s2 - and
also HS - so let us take this reaction
first h2s will be the key frame with
each class
it just means he is equal to zero it was
point 1 M solution 1 then 0 & 0 is equal
to equilibrium
this becomes point 1 minus X this is X
this becomes K 1 is what X square by
coin 1 minus X and that value is even
19.1 little is what - a you solve it you
get X is equal to nine point five four
twenty five minus five
thus the concentration of HS minus the
variable X concentration of H s minus s
done now let's start over the second
reaction is a Cleary actually I have it
it is minus skiers h plus plus these two
minus T is equal to 0 what is the value
this one this becomes 29.54 into 1 minus
v 0 individual at t is equal to
equilibrium this will be nine point five
for 9.50 change is 1 minus PI minus X
this becomes Texas
sorry this is not X this is ca t is
given to you it has some values and that
was nothing but h plus ions only enter
is 9
only because that's just - time yes
space also h plus last so T is equal to
0 this was 3 h plus ions also was a man
correct you see h plus and I just went
with a similar T is equal to 0 HS minus
will have what this right 9.5 1 minus 5
this is so same thing 9.5 put a minus 5
in and this will be Z at T is equal to
equilibrium
what will happen this guy will lose some
ym and this guy will gain some I am then
this guy will become 0 plus y you want
k2 we just put the value of K here K is
what this guy nine point five for 10 to
the power minus 5 plus y this
concentration of H+ concentration of s2
minus that is y divided by a
constitutional I just - that is nine
point five for 10 to power minus 5 minus
5 right and this value is what given one
point 2 into 10 to the power minus 40
right this is equal to this value so if
you solve this if you solve this
equation you get Y as 1 point 2 into 10
to power minus 13 itself see because
this guy in this great almost same right
this guy's cancelling because Y is very
small so this
925 to the power minus five only in this
day and we also become 925 can sense a
Wyatt come out only one point within the
power minus 30 and that is minus 2 minus
let's say for example the question says
assuming complete this association you
define the pH of the following solution
point zero three am a singer and finds
it if I am an Avenger so it says that I
have a CL and it completely dissociates
into H+ T is going to zero minus T and
was screened over minus VM T is equal to
e and what's the equilibrium or T is
equal to after some time in finite you
can say this becomes zero and I get 3
into 4 minus T an H+ ions and 3 minus 3
and C ailments so look pH is 4 minus log
of h plus ion doesn't rain so what is h
plus ion resolution 3 into power minus 3
that is nothing but 2 pi head all right
let's take this guy
neh neh will completely dissociate into
in a plus F of H minus s so let's
suppose G is equal to 0 it was 5 into 10
to the power minus 3 M please go inside
after some time this becomes 0 this
becomes 5 into 10 to power minus 3 M
becomes 5 minute ago Madison right so my
H minus concentration is what 5 in to
the minus M so h plus is what be 10 to
the minus 14 by Washburn is correct
because you know that H minus
concentration into your stress
calculation is going he now knew that is
10 to power minus 14
so with this you get S Plus s on the bar
10 to power minus 4 in by 5 into 10 to
the power minus 3 you solve it you get 2
into
is 12 so pH will be what - love X plus
concentration what is X plus here it
will be minus 2 you solid to get eleven
point seven zero and everything
so in this case when you'd associate
acid you directly get the concentration
of H+ but in case of BS you create the
concentration of H - first then you have
to find the conservation of Western
because find th you want the
concentration of H+ testa comics happily
to find the pH of the solution in gram
of EIU H dissolves in water to give in a
drop solution so I have t.i Oh H plus
water some water heaters needs u TI
class and homogeneous so exterior
chilled glass and oceans so we have two
grams and I have to find T is equal to
little what is the concentration of this
right and assuming 100% is position see
the past example the murder
concentration of e SCL and innovation in
ski minutes but here the gram is given
so first need to find them
morality molarity of language thi is
nothing but 2 pi
since Instagram - why - 21 just to do
Newman is a molecular mass into 1 by 20
microliters
thanks moles per liter there's nothing
but 4.5 to believe in the power minus 3
moles per liter or M this is the
molarity of clear watch so if you take
this exact equation so at T is equal to
0
- can we
loh will be what went to India - see
this will be zero and this amazing act
is going to in tonight this will become
zero and this will become 0.5 to 10 to
power minus 3 and this will also become
4 point 5 to 10 to power minus 2 so my H
+ o H minus concentration is what lives
there there is 4 point 5 2 into the bar
- so to find X plus y and conservation
together divide pH so I especially watt
in the bar - 14 by pashminas
concentration this is nothing but 10 to
the minus 14 by 0.5 to the power - see
you solve this unit you point to one 10
to the power minus 2 right this is the
very okay so creation - what - log of X
plus 10 something but - lava this value
to point in one 10 to the power minus 12
you solve this you get 11.66 th-thank
you visit exam viacom to watch free
educational videos try free online tests
get the best quality study materials
study from the best tutors and mentors
and much more thanks and serene
part 33 is brought you by example calm
no more free from exam before watching
the video please make sure that you have
watched all the previous parts now I
will take Poli basic acid and poly PC as
the base so what are these poly basic
acid body is English so if you see
something like s 2 s 4 I'll tell you it
has more than one so not so acid which
have more than one ionizer will protons
per molecule are called poly basically
as example in this case s 2 as a poor
you will first give you H person in a
simple manner and this hso4 minus ion in
again here h plus n is a promised to
enter right so in both case k will be
differently force to be k1 and then we
became the general example x2 x give you
h plus and expand HX 1 sign the k this
value that is h plus mu h x- by h 2 X
again this a chicks - from here you'll
be equilibrium with H plus and X minus 2
- I'll get a different kilos so again to
case K 1 and K right so the that process
different in quality DCT assets or
polyprotic acids again I nice even so I
get two different values of ki ki 1 and
cables that sound difference here right
and kill u 1 and K 2 whole power first
and second item on so there are two
constants for see if it is three example
I think is 3 3 or 4 it has 3 ni Shubin
for Dom so it will have k1 k2 k3 its
first intern - constant for this yes
this is a table for this if you see for
example if you see the phosphoric acid
if you see they are 3 K k1 k2 in 83
suffering acid
he won killing oxalic acid he even so he
can have K 1 K 2 or K 1 e 2 gauge
depending on the number of I another one
look of it has a please note if you see
the higher I order a nation percent are
smaller in the lower order einige
muscled-up
bigger so you see these value will be
more actually unless why you see the
next ionization will not happen so easy
example h2so4 gives X plus minus and
then minus X plus if you see this is
this will easily give 1 dash plus but
next express is difficult to get right
because already it has lost 1 dash plus
so this reaction will happen less in the
forward reaction and this the k-8 to
Adam this is a 1 it is a a k-8 value
will be lesser than k1 because this
reaction will happen more more in the
formulation this will have any less than
poverty
so the question says the first
ionization constant of h2s is 9 point 1
10 to power minus 8 so I have something
on s2 gas it gives as + + HS - and for
the skate a 1 is 9 point 1 21 - right
second ionization constant or this is 1
point 10 to power minus 13 you need to
qualify the concentration of s2 - and
also HS - so let us take this reaction
first h2s will be the key frame with
each class
it just means he is equal to zero it was
point 1 M solution 1 then 0 & 0 is equal
to equilibrium
this becomes point 1 minus X this is X
this becomes K 1 is what X square by
coin 1 minus X and that value is even
19.1 little is what - a you solve it you
get X is equal to nine point five four
twenty five minus five
thus the concentration of HS minus the
variable X concentration of H s minus s
done now let's start over the second
reaction is a Cleary actually I have it
it is minus skiers h plus plus these two
minus T is equal to 0 what is the value
this one this becomes 29.54 into 1 minus
v 0 individual at t is equal to
equilibrium this will be nine point five
for 9.50 change is 1 minus PI minus X
this becomes Texas
sorry this is not X this is ca t is
given to you it has some values and that
was nothing but h plus ions only enter
is 9
only because that's just - time yes
space also h plus last so T is equal to
0 this was 3 h plus ions also was a man
correct you see h plus and I just went
with a similar T is equal to 0 HS minus
will have what this right 9.5 1 minus 5
this is so same thing 9.5 put a minus 5
in and this will be Z at T is equal to
equilibrium
what will happen this guy will lose some
ym and this guy will gain some I am then
this guy will become 0 plus y you want
k2 we just put the value of K here K is
what this guy nine point five for 10 to
the power minus 5 plus y this
concentration of H+ concentration of s2
minus that is y divided by a
constitutional I just - that is nine
point five for 10 to power minus 5 minus
5 right and this value is what given one
point 2 into 10 to the power minus 40
right this is equal to this value so if
you solve this if you solve this
equation you get Y as 1 point 2 into 10
to power minus 13 itself see because
this guy in this great almost same right
this guy's cancelling because Y is very
small so this
925 to the power minus five only in this
day and we also become 925 can sense a
Wyatt come out only one point within the
power minus 30 and that is minus 2 minus
let's say for example the question says
assuming complete this association you
define the pH of the following solution
point zero three am a singer and finds
it if I am an Avenger so it says that I
have a CL and it completely dissociates
into H+ T is going to zero minus T and
was screened over minus VM T is equal to
e and what's the equilibrium or T is
equal to after some time in finite you
can say this becomes zero and I get 3
into 4 minus T an H+ ions and 3 minus 3
and C ailments so look pH is 4 minus log
of h plus ion doesn't rain so what is h
plus ion resolution 3 into power minus 3
that is nothing but 2 pi head all right
let's take this guy
neh neh will completely dissociate into
in a plus F of H minus s so let's
suppose G is equal to 0 it was 5 into 10
to the power minus 3 M please go inside
after some time this becomes 0 this
becomes 5 into 10 to power minus 3 M
becomes 5 minute ago Madison right so my
H minus concentration is what 5 in to
the minus M so h plus is what be 10 to
the minus 14 by Washburn is correct
because you know that H minus
concentration into your stress
calculation is going he now knew that is
10 to power minus 14
so with this you get S Plus s on the bar
10 to power minus 4 in by 5 into 10 to
the power minus 3 you solve it you get 2
into
is 12 so pH will be what - love X plus
concentration what is X plus here it
will be minus 2 you solid to get eleven
point seven zero and everything
so in this case when you'd associate
acid you directly get the concentration
of H+ but in case of BS you create the
concentration of H - first then you have
to find the conservation of Western
because find th you want the
concentration of H+ testa comics happily
to find the pH of the solution in gram
of EIU H dissolves in water to give in a
drop solution so I have t.i Oh H plus
water some water heaters needs u TI
class and homogeneous so exterior
chilled glass and oceans so we have two
grams and I have to find T is equal to
little what is the concentration of this
right and assuming 100% is position see
the past example the murder
concentration of e SCL and innovation in
ski minutes but here the gram is given
so first need to find them
morality molarity of language thi is
nothing but 2 pi
since Instagram - why - 21 just to do
Newman is a molecular mass into 1 by 20
microliters
thanks moles per liter there's nothing
but 4.5 to believe in the power minus 3
moles per liter or M this is the
molarity of clear watch so if you take
this exact equation so at T is equal to
0
- can we
loh will be what went to India - see
this will be zero and this amazing act
is going to in tonight this will become
zero and this will become 0.5 to 10 to
power minus 3 and this will also become
4 point 5 to 10 to power minus 2 so my H
+ o H minus concentration is what lives
there there is 4 point 5 2 into the bar
- so to find X plus y and conservation
together divide pH so I especially watt
in the bar - 14 by pashminas
concentration this is nothing but 10 to
the minus 14 by 0.5 to the power - see
you solve this unit you point to one 10
to the power minus 2 right this is the
very okay so creation - what - log of X
plus 10 something but - lava this value
to point in one 10 to the power minus 12
you solve this you get 11.66 th-thank
you visit exam viacom to watch free
educational videos try free online tests
get the best quality study materials
study from the best tutors and mentors
and much more thanks and serene
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