Hydrogen selenide, also known as hydroselenic acid in its aqueous form, has the chemical formula H₂Se. Its CAS number is indeed 7783-7-5. This compound is a colorless gas that is extremely toxic and flammable. Here are some characteristics of hydrogen selenide:
Physical Properties:
Appearance: Colorless gas with a pungent odor similar to rotten eggs, though more intense.
Boiling Point: -41.4 °C.
Melting Point: -85.4 °C.
Density: At STP, it is denser than air.
Solubility: Soluble in water and polar organic solvents.
Chemical Properties:
Reactivity: It is highly reactive and can ignite spontaneously in air.
Acidity: In water, it forms a weak acid, hydroselenic acid (H₂Se).
Decomposition: It can decompose into elemental selenium and hydrogen under certain conditions.
Uses:
Semiconductor Industry: Used in the production of selenium compounds for semiconductors and photovoltaic devices.
Analytical Chemistry: Used as a reagent in analytical chemistry.
Research: Utilized in scientific research for the synthesis of selenium-containing compounds.
Safety Considerations:
Toxicity: Extremely toxic by inhalation, even in low concentrations; exposure can lead to severe health effects including death.
Flammability: Flammable gas that can form explosive mixtures with air.
Handling: Requires strict safety protocols, including use in fume hoods and appropriate personal protective equipment.
Due to its toxicity and handling requirements, hydrogen selenide is not typically available from general chemical suppliers. Instead, it is usually produced on-site in laboratories or facilities where it is immediately used. Specialized suppliers that cater to industries requiring hydrogen selenide would be the source for purchasing this substance, although it's more common for it to be generated as needed rather than stored or transported.
Companies that supply hydrogen selenide or its precursors might include specialty chemical manufacturers or those that specifically cater to the semiconductor industry. Always ensure compliance with local regulations and safety guidelines when dealing with hydrogen selenide, and handle it only under controlled conditions with appropriate safety measures in place.
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