A colourless, toxic, flammable gas with a characteristic smell of rotten eggs. It is found naturally in volcanic gases and is often formed during decay of animal matter. Hydrogen sulfide is slightly soluble in water forming a very weak dibasic acid that is sometimes called hydrosulfuric acid.
It is used as an antiseptic, a bleach and as a chemical reagent.
Hydrogen sulfide may be produced by
- reacting hydrogen gas with molten sulfur or sulfur vapours
- treating a metal sulfide with an acid.
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