Hydrogen sulfide

Features of Hydrogen sulfide

Hydrogen sulfide, H2S, is a toxic and flammable gas.

Physical and chemical properties

Physical state: Liquefied gas
Molecular weight: 34 g/mol
Smell: Of rotten eggs, persistent, hardly noticeable in high concentrations
Appearance/color: colorless


Hydrogen sulfide is used:

  • for the production of sodium and thiophene sulfide that are used in the chemical industry for the protection of iron or carbon steel against the corrosion in salt-using processes (e.g. sodium chloride);
  • in calibration mixtures for environmental monitoring (petrochemical industry);

Stability and reactivity

It can form explosive mixtures with the air.
It reacts with water to form corrosive acids.
It can reacts violently with alkali.