detection of phosphorus in organic compound [closed]








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I searched on internet and I don't find any elaboration of " detection of phosphorus " by chemical equation please elaborate it with chemical equations




To check whether phosphorus is present in the organic compound or not:


The organic compound is treated with sodium peroxide($\ce{Na2O2}$). 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:


$$\ce{Na3PO4 + 3HNO3 ->H3PO4 +3NaNO3}$$


$$\ce{H3PO4 + 12(NH4)2MoO4 + 21HNO3 ->(NH4)3PO4.12MoO3 (yellow ppt.) + 21NH4NO3 + 12N2O}$$


[![enter image description here](https://i.stack.imgur.com/2Ci8n.jpg)](https://i.stack.imgur.com/2Ci8n.jpg) 


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