Hydrogen sulfide (H₂S)
A colorless, toxic gas with the characteristic odor of rotten eggs. It occurs in certain mineral waters and spring waters.
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Hydrogen sulfide H₂S
Molar mass: 34.08 g/mol
Melting point: -85.6 °C (-122.08 °F)
Boiling point: -60.3 °C (-76.54 °F)
Relative steam density (air=1): 1.19
Hydrogen sulfide is a colorless, heavier-than-air gas at room temperature with the odor of rotten eggs. It is highly toxic: in small quantities, it causes headache or nausea; in higher concentrations, it causes instant paralysis and death.
It dissolves well in water and forms sulfites with metals. Burning with a bluish flame, hydrogen sulfide turns into water and sulfur dioxide. It can be oxidized to elemental sulfur relatively easily in a slightly acidic environment.
Occurrence and production
It occurs in nature in volcanic gases, spring waters and certain mineral waters. It forms during the decomposition of sulfur-containing proteins. In laboratories, it is produced in a reaction of iron sulfide and diluted hydrochloric acid in Kipp’s apparatus.
It can be used for ion detection in chemical analysis because it forms a precipitate with certain metal ions.
A colorless, odorless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.
A colorless, odorless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.
A compound ion produced when sulfuric acid releases a proton.
An odorless, yellow, solid substance, the 16th most common in the Earth´s crust. One of the best known sulfur compounds is pyrite, also known as ´fool´s gold´.
Sulfur dioxide emission is the main cause of acid rains. It is an intermediate product in the production of sulfuric acid.
One of the oxides of sulfur, forms sulfuric acid with water.
A colorless, viscous liquid, a highly corrosive, strong acid used in several industrial processes.
Colorless, moderate acid, only known in aqueous solution.
Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.
Colorless, odorless, lighter-than-air gas. The most common chemical element in the universe.