In the quantitative estimation of phosphorus, the organic compound is heated with fuming nitric acid — Practical Organic Chemistry and Purification Chemistry Question
Question
In the quantitative estimation of phosphorus, the organic compound is heated with fuming nitric acid and then treated with ammonia and ammonium molybdate. What is the color and formula of the resulting precipitate?
Answer: A
💡 Solution & Explanation
Heating with fuming nitric acid oxidizes phosphorus to phosphoric acid ($H_3PO_4$). Addition of ammonia and ammonium molybdate produces a canary yellow precipitate of ammonium phosphomolybdate, with the chemical formula $(NH_4)_3PO_4 \cdot 12MoO_3$.
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