Why potassium iodide is used in arsenic limit test

1.	Why potassium iodide is used in arsenic limit test
Answer» Answer: 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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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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Why potassium iodide is used in arsenic limit test​

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Why potassium iodide is used in arsenic limit test