Oxoacids of Phosphorus Video Lecture - NEET

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Oxford seeds of phosphorus
they are the acid which has they are
first acid and it has both oxygen and
hydrogen see in this case all these case
you say phosphorus is tetrahedral is
surrounded tetrahedrally surrounded by
other atoms right so you have P o and at
least one Poh one it is my observe a
sets so some of the also acids are my
hypo phosphorous acid my ortho
phosphorus assets pyro phosphorous acid
hypo phosphorus acid orthophosphoric
acid pyro phosphoric acid and made up
phosphoric acid these are my common
oxide sets of phosphorus the forest
the first one is hypo phosphorous acid
that is the lipid h3 p o2 in this case
the oxidation state so the s3 pu to the
oxidation state is plus 1 or phosphorus
hypo phosphorous acid are also called
faust Finnick acid to prepare this you
want to prepare this what you can do is
you can take this phosphorus and you can
take any alkaline in the alkaline but it
takes some water molecule water here you
get h2 po2 minus n ph 3 ok now the
property if you want this is a color
solid
this is colourless solid melting point
is a almost 403 Kelvin and the strong
reducing agent is strong reusing
agent this is both alcohol and water
Asami
why water soluble you see they'll be
hydrogen bond here this is mole opening
this is mono today okay see there is a
structure h3p Oh to see there is a P
double bond o and Poh bond go okay the
next one is ortho phosphorous acid the
formula is a ch3 bo3 here oxidation same
to me plus three four phosphorus also
called phosphonic acid so to prepare you
take P 2 O 3 react with water you form s
3 bo3 it's diprotic if you see there -
for watching CI protein the earlier one
was monoprotic only one in which it is a
colourless solid again colourless solid
and the melting point is here is almost
346 Kelvin it's again as strong you are
using it it strong reducing agent now if
you see this +3 put phosphorus is non
stable the intermediate oxidation state
so it will disproportionately so if I
have s 3 P or 3 it will form h3po4 and
pH 3 so in this case we see this had
oxidation you're plus 3 and this becomes
plus 5 this is Plus this
disproportionate actually
okay let's see one thing if we talk with
the reducing capacity this reducing the
adversity directly depends on the number
of th one more is the number of pH born
more is the number of th bond the more
is the reducing capacity of this as if
you see this pH one is non ionizable it
doesn't break into H+ and this - doesn't
break it right so it doesn't play any
low in viscosity but it helps in main
it's more powerful reducing agent so the
more the number of th one the more is
the reducing chemistry for all the
oxoacids the next is pyro phosphorous
acid so pile of Oscars aside the formula
is h4 p25 in this oxidation number of
phosphorus will be costly this is the
structure h4 duo file
okay and to prepare this you take PCL 3
you react with h3 bo3 to get h4 that's
all you get and this is the torture of
pile of phosphorus as the next is hypo
phosphorous acid
the formula is s4 e - o 6 oxidation of
iron means 12 minus 8 plus 4 and to
prepare this you wiii take red
phosphorus and takes a Mulcahy you do
the reaction is you get this is the
structure of hypo phosphoric acid
similarly we have pyro phosphoric acid
pyro phosphoric acid is h4 p 2 o 707 so
in this case oxidation number of
phosphorus will be 14 minus n by 2 5
plus 5
if you see in this case it is tetra
protic one two three four tetra protic
acid this is again white solid solid
white to form this but again do it again
do h3po4 you can heap this at five 20
Kelvin you get h4 p 207 and some bottom
of this tetra product see it says it as
four or aesthetic so if you want to know
what does the product level you have to
actually draw the structure okay the
next is orthophosphoric acid that is
h3po4 here oxidation state of phosphorus
is plus pi or in you two eight eight
minus three PI plus pi also called
phosphoric acid
this is triprotic one two three go h2 I
put this again white crystalline solid
very important phosphoric acid or very
popular this is white crystalline solid
phosphoric acid and this is used for
food additive lentil fertilizers home
training products all this it is used to
prepare this you take p4o10 which we
have studied mix with some water you get
some s30 foot you can also take my
proper phosphorus reacting nitric acid
presence of salt water you give s 3 u 4
plus no.1 try the balanced reaction this
is 10 this is 4 this is 5 this then we
have made on phosphoric acid made up
phosphoric acid is nothing but H P o 3h
po3 you see this H P O 3 and there are n
numbers HP o 3 attached and there is H
and H here there's my made-up possibly
the first question is how do you account
the reducing behavior s3 po2 on the
basis of its structure so you have toned
and reducing behavior based on the pH
bond number of P is 100 the number of pH
bond more in the reducing capacity if
you draw s3 p or 2 structure is
something like this it has two pH bonds
it has two pH bonds so it is having good
amount of reducing characteristic the
next question is how do you account the
basicity of h3po4 speed wrong the h3po4
structure this is my h3po4 structure it
has actually three OS let's try plotting
type order right why or try basing that
means you can say that yeah it is basic
my its trifle triprotic acid the next is
what happens when h3 p o3 is heated cs3
p o3 the oxidation number is +3 right so
it will go for the disproportion Asian
reaction you have a ch3 P or 3 Y will
say it is in the intermediate range h3 p
o3 and you heat it becomes a ch3 3 or 4
and ps3 this is my phosphine this is my
orthophosphoric acid so this has
oxidation state of plus 5 it says X Q
minus 3 and this is plus 3
this is how it happens it term undergoes
this proportion action reaction
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