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In an organic compound phosphorus is est...

In an organic compound phosphorus is estimated as

A

`Mg_(2)P_(2)O_(7)`

B

`Mg_(3)(PO_(4))_(2)`

C

`H_(3)PO_(4)`

D

`P_(2)O_(5)`

Text Solution

Verified by Experts

The correct Answer is:
A
A pre-weighed amount of organic compound is heated with concentrated nitric acid `(HNO_(3))` in a tube. Phosphorus present in the compound gets converted into phosphoric acid. Now the content of tube are heated with magnesia mixture i.e. `MgSO_(4)+NH_(4)Cl +NH_(4)OH , ` so formed which is collected , washed , dried and ignited to get magnesium pyrophosphate `Mg_(2)P_(2)O_(7)`, which is the weighed.
`underset("acid")underset("Phosphoric")(H_(3)PO_(4)) overset("Magnesia mixture")to underset("phosphate (white ppt.)")underset("(Magnesium ammonium)")(MgNH_(4)PO_(4)+3HCl)`
`2MgNH_(4)PO_(4) overset(Delta)toMg_(2)P_(2)O_(7) darr + 2NH_(3) +H_(2)O`
Knowing the weight of `Mg_(2)P_(2)O_(7)` , percentage of phosphorus can be calculated.
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