Sodium hydrosulfide

• Sodium hydrosulfide
• Sodium hydrosulfide

Colorless to yellow, deliquescent crystals with odor of rotten eggs

Fixed

1.79 g · cm -3

52-54 ° C ( monohydrate)

350 ° C ( anhydrous)

Well in water (620 g · l-1 at 20 ° C)

Risk

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Sodium hydrosulfide is a sodium salt of hydrogen sulphide. It belongs to the group of hydrogen sulfides.

Production

In the laboratory, sodium hydrogen sulfide is obtained from anhydrous sodium ethoxide and hydrogen sulfide:

Properties

Sodium hydrogen sulfide is a white, granular, crystalline, very hygroscopic powder that is very soluble in water and sparingly soluble in ethanol. It turns on heating in dry air yellow, orange at higher temperature and melts at about 350 ° C to a black liquid. Pure sodium hydrogen sulfide dissolves in hydrochloric acid with vigorous hydrogen sulphide development. The compound has a rhombohedral distorted sodium chloride structure.

Use

Sodium hydrogen sulfide is technically used in some processes, like this:

• Precipitation of heavy metals in wastewater treatment plants.
• In the leather industry to remove a hair from hides.
• In the paper or pulp manufacturing, in order to remove the lignin from the wood chips.

In a variant of Asinger reaction ( a multi -component reaction ) is reacted with an α - haloaldehyde, ammonia and an additional carbonyl compound ( aldehyde or ketone ) to form 3- thiazolines of sodium hydrosulfide.