What is the oxidation number of phosphorus in H3PO3?

Answer 1

Oxidation number of P in H3PO3 is +3. To calculate the oxidation number

H= 1 except when bonded to metal

O is -2 except when bonded to F

The sum of all of the oxidation number on a molecule /ion is equal to the charge so as H3PO3 is a neutral molecule:-

0 = OxP + 3OxH + 3OxO = Oxp + 3 + (-6)

Oxp = +3

H3PO3 is phosphorus acid. However when you try to make it in aqueous solution, it "tautomerises" , turning into phosphonic acid, HPO(OH)2- same formula H3PO3, but its got a P-H bond and a P=O bond. The oxidation number of P is still 3

Answer 2

Phosphorus ahs an ocxidation number of 3. Phosphoric acid, H3PO3 has structure where there is one hydrogen (-H), two hydroxyl groups (-OH) and one oxgen (=O) attached to the central phosphorus P

Using the normal rules, H= +1, O = -2, OH = -1 and balancing out the "charges" we get P =+3

Answer 3

HPO3 = -2

H= +1

O= -2

Ox3=-6

H+P+O3= -2

1+x+-6=-2

-5+x=-2

X=+3

P=+3

Answer 4

+1 for each H; -2 for each O; +5 for each P

Answer 5

+1 for each H, +3 for P, -2 for each O

Answer 6

p=+5