Hydrosulfuric Acid

Hydrosulfuric acid, also known as hydrogen sulfide or sulfane is a chemical compound. Its chemical formula is H2S. It exists in the form of a colourless gas and has a rotten egg smell.

Hydrogen sulfide was discovered by Carl Wilhelm Scheele in 1777.

Carl Wilhelm Scheele discovered Hydrosulfuric Acid.
Carl Wilhelm Scheele (Source)

Chemical Properties of Hydrosulfuric Acid

Here are the chemical properties of Hydrosulfuric acid

Chemical FormulaH2S
Molar Mass34.08 g mol-1
Density1.363 g dm-3
Melting Point-82℃
Boiling Point-60℃
Solubility in Water4 g dm-3
Heat Capacity1.003 J K-1g-1
Enthalpy of Formation-21 kJ mol-1

Production of Hydrosulfuric Acid

Hydrosulfuric acid is most commonly obtained from sour gas. This gas can also be produced by treating hydrogen with molten elemental sulfur

A standard lab preparation:

FeS + 2HCl -> FeCl2 + H2S

Many metal and nonmetal sulfides liberate hydrogen upon exposure to water, 

6H2O + Al2S3 -> 3H2S + 2Al(OH)3

A small amount of hydrogen sulfide occurs in crude petroleum. It also occurs from human activity, i.e., from industrial sources such as petroleum refineries.


  • Hydrogen sulfide is used to produce various organosulfur compounds, such as methanethiol, ethanethiol, etc.
  • It was also important in analytical chemistry in the qualitative inorganic analysis of metal ions.
  • It is used to separate deuterium oxide(heavy water) from normal water via the Girdler sulfide process.
  • It is also used as an agricultural disinfectant.


What is the use of hydrogen sulfide in daily life?

It is used by farmers in agriculture as disinfectants.

What is the formula for Hydrosulfuric Acid?

The chemical formula of hydrogen sulfide is H2S.

Is hydrogen sulfide harmful to humans?

Being exposed to medium concentration levels of H2S can lead to severe eye irritations, respiratory issues, nausea, etc.

More on Inorganic Compounds

Copper Hydroxide (Cu(OH)2)Ammonium Persulfate ((NH4)2S2O8)
Chlorine Trifluoride (ClF3)Barium Carbonate (BaCO3)
Sodium Sulfate (Na2SO4)Chromic Acid (H2CrO4)

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