Question

Addition of sulphuric acid in baruim sulphate

Answer 1

In contrast to barium sulfate, bariumsulfide is soluble in water and readily converted to the oxide, carbonate, and halides. To produce highly pure barium sulfate, the sulfide or chloride is treated with sulfuric acid or sulfate salts: ... Barium sulfate is one of the most insoluble salts of sulfate.