Question

Sodium sulphide is used in which of the test heavy meatls ??​

Answer 1

Answer:

Limit test of heavy metals is based on the reaction of metallic impurities with hydrogen sulfide in acidic medium to form colored solution. Metals that response to this test are lead, mercury, bismuth, arsenic, antimony, tin, cadmium, silver, copper, and molybdenum.

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Answer 2

Solution :

must

know What is SODIUM SULPHIDE ?

Sodium sulfide is a salt which plays an essential role in the organic chemistry industry. The formula for sodium sulfide is Na,S, Na,S-9H,O. Sodium sulfide is a water-soluble compound, with a strongly alkaline solution. If the compound is exposed in the moist air, Na,S and its hydrates emission smells like a rotten egg. The solid- state of sodium sulfide in solution is a yellow colour, and it comes as grades, known as sodium sulfide flakes. The IUPAC name of sodium sulfide is disodium sulfide.

It's uses are

1. Sodium sulfide is mainly used in the pulp and paper industry for the kraft process.
2. As in the kraft process, wood is converted into wood pulp, sodium hydroxide and sodium sulfide help to dissolve the lignin of wood fibre.
3. This compound is used in water In this method, sodium sulfide acts as an oxygen scavenger treatment.
4. For chemical photography, sodium sulfide is used as a metal precipitant for toning black and white photographs In the textile industry, sodium sulfide is bleaching agent In the production of rubber chemicals, and sulfur dyes compounds are used.

Btw it's used in testing heavy metals because

Chemical precipitation using hydroxides or sulfides is one of the most commonly used methods for removing metals from water and wastewater. During metal hydroxide precipitation, large amounts of solids are formed. As a result, metal hydroxide is getting amphoteric and it can go back into the solution. On the other hand, use of sulfides is characterized by lower solubility compared with that of metal hydroxides, so a higher degree of metal reduction can be achieved in a shorter time. Hence SODIUM SULPHIDE is used in testing heavy metals.

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