Welcome to ChemZipper !!!: Oxy acids of Phosphorous:

Search This Blog

Oxy acids of Phosphorous:


Phosphorus forms two series of oxyacids namely; phosphorus acid and phosphoric acid.
SN
Element
Formula
Name of the Oxyacid
O.S.
2
Phosphorus
H3PO2
H3PO3
H4P2O7
Hypo Phosphorus acid
Ortho Phosphorus acid
Pyro phosphorous acid
+1
+3
+3
3
Phosphoric
H4P2O6
H3PO4
 H4P2O7
(HPO4)n
Hypo Phosphoric acid
Ortho Phosphoric acid
Pyro Phosphoric acid
Meta phosphoric acid
+4
+5
+5
+5
4
Arsenic
H3AsO3
H3AsO4
Arsenious acid
Arsenic acid
+3
+5
5
Sb & Bi
No stable acid



 (A) Phosphorus acid series: (Structure)
The series consists of p atom exhibiting oxidation state of +3. They act as reducing agents.
                

(B) Phosphoric acid series: (Structure) 
This series consist of acids having p in +5 oxidation state.
   
                           
Note : Meta phosphoric does not exist in monomeric form, but it exists as cyclo meta phosphoric acid (HPO3)3 or   polymeta phosphoric acid (HPO3)n.  Sodiumhexametaphosphate is a famous salt known as CALGON  and use water softener.


Special Note:
(1)  Meta is used for acid obtained by loss of H2O molecule.
(2)  Pyro is used for the acid obtained from two molecules with a loss of H2O.
(3)  Hypo is used for the acid having lower oxygen content than the parent acid.

Related Questions:



Trisilyl amine, N(SiH3)3 is planar whereas trimethyl amines N(CH3)3 is pyramidal. Explain why?.















No comments:

Post a Comment

Top Search Topics