Which precipitating reagent is added to test for the presence of Sulfate ions (SO4 2-) forming a white precipitate insoluble in dilute HCl?
Answer and explanation
Correct answer: D. Barium chloride solution (BaCl2)
- Step 1: Adding aqueous BaCl2 to a neutral or acidic solution containing sulfate ions precipitates barium sulfate. Step 2. BaSO4 forms a heavy white precipitate that remains completely insoluble even in boiling dilute hydrochloric acid. Answer: Barium chloride solution (BaCl2). Why not the others: AgNO3 precipitates halides; Lead acetate tests sulfide ions forming black PbS; Ferric chloride tests phenols or acetate.
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