Question
Question: The formula of meta phosphoric acid is : (A)\({{H}_{2}}P{{O}_{3}}\) (B)\({{H}_{3}}P{{O}_{3}}\) ...
The formula of meta phosphoric acid is :
(A)H2PO3
(B)H3PO3
(C)HPO3
(D)H4P2O7
Solution
Acid with oxidation number +5 ends with -ic suffix. And acid with oxidation number +3 ends with –ous suffix. Meta phosphoric acid is a very weak acid.Phosphorous form various oxoacids.These acids are generally seen too disproportionate to either lower and higher oxidation states.
Complete step by step answer: The formula of meta phosphoric acid is HPO3. Meta phosphoric acid is a corrosive, inorganic, cyclic polyphosphate formed from bonded phosphoric units. It has a molar mass of 80g/mol.It has applications in biochemistry, agriculture, pharmacy and chemical research.
-Considering other options, Option (A), H2PO3, it is Dihydrogen phosphite. Dihydrogen phosphite is a monovalent inorganic anion obtained by deprotonation of phosphoric acid. It is a conjugate base of a phosphorous acid. It is a conjugate acid of a hydrogen phosphite.
-Considering option (B), H3PO3, it is phosphorus acid. This acid is diprotic acid. It has a molar mass of 82g/mol.
-Considering option (D), H4P2O7, it is pyrophosphoric acid. It is also known as Diphosphoric acid. IT is colorless, odourless. It is soluble in water, diethyl ether, and ethyl alcohol. It has a molar mass of 177.98g/mol.
Note: HPO3 is a very weak acid. Phosphorus acid has pka in the range of 1.26-1.3. The Hydrogen atom bonded directly to the phosphorus atom is not readily ionizable. On heating at 200∘C, phosphorus acid disproportionate to phosphoric acid and phosphine.