# (NH4)2MoO4 is used for the detection of__________

(NH4)2MoO4 is used for the detection of phosphorous.

### Explanation

(NH4)2MoO4   is the chemical formula of the compound Ammonium orthomolybdate. The compound is a white solid that is prepared by treating molybdenum trioxide with aqueous ammonia.

### Detection of phosphorous

The organic compound Ammonium orthomolybdate is treated with sodium peroxide(Na2O2). Phosphorus gets converted to sodium phosphate.

• The aqueous extract is heated with concentrated nitric acid (HNO3) and ammonium molybdate{ (NH4)2MO4 )}.
• A canary yellow precipitate of ammonium phosphomolybdate is collected.
• This yellow precipitate formed shows that Phosphorus is present in the organic compound.

Reaction that take place during the process

• In the first step, the reaction takes place as follows

Na3PO4+3HNO3⟶H3PO4+3NaNO3

• In the second step, the reaction takes place as follows

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

(NH4)3PO4⋅12MoOis the yellow precipitate formed.