The chemical formula of hydrogen sulfide is H₂S
Hydrogen sulfide is an inorganic compound with the chemical formula H₂S. Under normal circumstances, it is a colorless and flammable acidic gas. When the concentration is low, it has a foul smell and smells like rotten eggs; when the concentration is high, it has no smell (because high concentration of hydrogen sulfide can paralyze the olfactory nerve). It is soluble in water, and 1 mole of water can dissolve about 2.6 moles of hydrogen sulfide at 0 °C. The aqueous solution of hydrogen sulfide is called hydrosulfuric acid, which is a weak acid. When it is heated, hydrogen sulfide escapes from the water. Hydrogen sulfide is an acute and highly toxic. Inhalation of a small amount of high concentration hydrogen sulfide can be fatal in a short time. Low concentrations of hydrogen sulfide have effects on the eyes, respiratory system and central nervous system.
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