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A certain brand of plant food contains ammonium phosphate . What tests would you use to...

A certain brand of plant food contains ammonium phosphate . What tests would you use to verify the presence of both the cation and anion in the substance ?
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Answer #1

If the plant has ammonium phosphate , the cation present will be ammonium ion NH4+ and the anion present will be phosphate ion PO4-

The ammonium ion can be tested by addition of base NaOH . If the sample liberates ammonia gas and turns the indicator paper to alkaline , the presence of ammonium cations is confirmed.

For testing the presence of phosphate ions , a standard phosphate test can be done using ammonium molybdate solution . The presence of yellow precipitate confirms the presence of anions .

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