# What is the oxidation state of phosphorus in HPO3?

+3

#### Explanation:

Phophite ($P {O}_{3}^{3 -}$) has a charge of -3, so I'm going to guess you meant to ask what the oxidation state of P was in ${H}_{3} P {O}_{3}$

In ${H}_{3} P {O}_{3}$ the oxygens will always have a -2 charge and hydrogen is +1.

So the total positive charge from Hydrogen is +3 (+1 x 3)
The total negative charge from Oxygen is -6 (-2 x 3)

The compound is electrically neutral, so the phosphorus must have an oxidation state of +3.

3H = +1 x 3 = +3
1P = +3 x 1 = +3
3O = -2 x 3 = -6

Total charge = 0

Hope this helps!