Phosphorous in any organic compound can be estimate by the formula
`% of P = wt. of Mg_2P_2O_7 underset{wt.of compound}{stackrel{mbox(formed) xx 62}{rightarrow}} xx 100xx222` This formula is related to
| A. |
Carius method |
 |
| B. |
Lassaigne;s method |
| C. |
Kjeldahl's method |
| D. |
Duma's method |
When organic compound is treated with conc. `HNO_3` in a carrier tube P present on organic compound can be converted into `H_3 PO_4` . Contents of tube is heated with `MgCl_2` in presence of `NH_4Cl` and `NH_4OH`. Then `MgNH_4` `PO_4` is foremed which id dried and weighted.
