Chemistry, asked by sumitt2261, 1 year ago

Test for phosphorus in organic compounds with chemical reactions

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Answered by Adhi23

The organic compound is treated with sodium peroxide(Na2O2). Phosphorus gets converted to sodium phosphate. Then we carry out the same procedure that we do to identify phosphate anion.

The aqueous extract is heated with concentrated nitric acid and ammonium molybdate. A canary yellow precipitate of ammonium phosphomolybdate is obtained. This yellow precipitate helps us conclude that Phosphorus was present in the organic compound.

Reactions:

Na3PO4+3HNO3⟶H3PO4+3NaNO3
H3PO4+12(NH4)2MoO4+21HNO3⟶(NH4)3PO4⋅12MoO3 (yellow ppt⋅)+21NH4NO3+12N2O

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