Phosphoric acid is used in carbonated beverages contain 3.086%(w/w) hydrogen,,31.61%(w/w) phosphorus and remaining oxygen. If atomic mass of hydrogen, phosphorus and oxygen are 1.01U, 31.0 U and 16U Respectively. and if molar mass of phosphoric acid is 98.03 g/mol. What is the molecular formula of phosphoric acid?
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Explanation:
The behaviour is linked with the oxidation state of phosphorus atom in the two acids. In phosphorus acid (H3PO3), the oxidation state of P is + 3. It is in a position to increase its oxidation state (acts as reducing agent ) as well as decrease it (acts as oxidising agent). The oxidation state of phosphorus in phosphoric acid (H3PO4) is + 5. Since it cannot increase it beyond 5, it cannot act as a reducing agent. However, it can behave as oxidising agent by decreasing its oxidation state.
We can also say that H3PO3 undergoes disproportination while H3PO4 does not.
H3PO3+3−→heatPH3−3+3H33H3PO4+5
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