Which of the following is precipitated when an arsenate reacts with a magnesia mixture? — Qualitative and Quantitative Analysis Chemistry Question
Question
Which of the following is precipitated when an arsenate reacts with a magnesia mixture?
Answer: C
💡 Solution & Explanation
Step 1: In qualitative analysis, magnesium ions are detected after separating other group cations. Step 2: Adding disodium hydrogen phosphate (Na2HPO4) in the presence of ammonium hydroxide (NH4OH) and ammonium chloride (NH4Cl) precipitates Mg2+ as a white crystalline solid of magnesium ammonium phosphate hexahydrate. Step 3: The composition of this precipitate is MgNH4PO4 . 6H2O, corresponding to option (d).
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