Chemistry, asked by Anamika123456, 11 months ago

why we add stannated HCL in limit test of arsenic

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Answered by taibak32

10

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Limit test of Arsenic is based on the reaction of arsenic gas with hydrogen ion to form yellow stain on mercuric chloride paper in presence of reducing agents like potassium iodide. ... Arsenious acid is further reduced to arsine (gas) by hydrogen and reacts with mercuric chloride paper to give a yellow stain.

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