Gravimetric Determination of Orthophosphate

In an alternative procedure, filter through a prepared G4 sintered porcelain crucible, wash with dilute ammonia as above. Then dry the crucible first in an oven at 150°C then in a muffle furnace at 1100°C to constant weight. Calculate from either method the concentration of P04 in mol dm .  

3 Investigating the yellow complex formed from phosphate, molybdate and vanadate 

A yellow complex is formed when acidified solutions of ammonium vanadate, ammonium molybdate and an orthophosphate are mixed. 

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