Let's study Chemistry 11
Chemistry
Level
2
Sally heated an organic compound in fuming nitric acid, and then treated it with ammonium molybdate, resulting in a yellow precipitate.
Which of the following elements must the organic compound have?
S
P
Cl
N
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The ammonium molybdate test is a simple qualitative method to determine the presence of phosphate ions in a sample as follows. A small amount of the sample is acidified with concentrated nitric acid to which a little ammonium molybdate is added. The presence of phosphate Ions is indicated by the formation of a bright yellow precipitate layer (ammonium phosphomolybdate).
The above are extracts from this article .