Question

In arsenic limit test yellow stain obtained due to​

Answer 1

Answer:

Explanation:

Limit Test for Arsenic in Pharmaceutical Analysis. This is based on the reaction of the arsenic gas with hydrogen ion to a yellow stain of mercuric chloride paper. ... Potassium iodide used as a lessening agent.

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Answer 2

The yellow stain obtained on the mercuric chloride paper in the arsenic limit test is due to the reaction of arsine gas with HgCl₂.

• Gutzeit test is the other name for the Arsenic limit test.
• Arsenic is present in the form of arsenic acid in the sample.
• Reducing agents like potassium iodide, reduce arsenic acid to arsenious acid.
• Arsenious acid on further reduction forms arsine gas which forms a yellow-colored stain on the mercuric chloride paper.