Question

why hydrogen sulphide used in limit test of heavy metals​

Answer 1

Explanation:

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Limit test of heavy metals is based on the reaction of metallic impurities with hydrogen sulfide in acidic medium to form colored solution. ... Limit test of lead is based on the reaction of lead and diphenyl thiocabazone (dithizone) in alkaline solution to form lead dithizone complex which is read in color.

Answer 2

Answer:

Hydrogen sulfide is commonly used in the limit test of heavy metals because it reacts with many heavy metal ions to form insoluble metal sulfides. This reaction is used as a qualitative test for the presence of heavy metals in a sample.

• In the limit test, a small amount of the sample is dissolved in water or acid, and a stream of Hydrogen sulphide gas is passed through the solution.
• If heavy metals are present in the sample, they will react with the H2S gas to form characteristic-colored precipitates.
• The color of the precipitate can provide information about the identity of the heavy metal present.

• The limit test is useful for quickly screening samples for the presence of heavy metals, but it does not provide quantitative information about the amount of heavy metal present.
• In addition, the test may not be sensitive enough to detect very low levels of heavy metals in a sample.

Overall, the use of hydrogen sulfide in the limit test of heavy metals is a simple and effective way to qualitatively detect the presence of heavy metals in a sample.

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