21548-73-2

Basic information

• Product Name: Silver sulfide
• Synonyms: Disilvermonosulfide;Disilver sulfide;Silver sulfide (Ag2S);Silver(1+) sulfide
• CAS NO: 21548-73-2
• Molecular Formula: Ag2S
• Molecular Weight: 247.8014
• EINECS: 244-438-2
• Product Categories: Catalysis and Inorganic Chemistry;Chemical Synthesis;Silver;Metal and Ceramic Science;Inorganics;Chalcogenides;Materials Science
• Mol File: 21548-73-2.mol
• Article Data: 0

Chemical Properties

• Melting Point: 845 °C(lit.)
• Boiling Point: decomposes [HAW93]
• Appearance: Black powder
• Density: 7.234 g/mL at 25 °C(lit.)
• Solubility: Soluble in aq. HCN, aq. citric acid with KNO3. Insoluble in acids, alkalies, aqueous ammoniums.
• Water Solubility: Soluble in HNO{3}, alkali cyanide solutions. Insoluble in water
• Stability: Stable. Incompatible with acids, strong oxidizing agents.
• Merck: 14,8530
• CAS DataBase Reference: Silver sulfide(CAS DataBase Reference)
• NIST Chemistry Reference: Silver sulfide(21548-73-2)
• EPA Substance Registry System: Silver sulfide(21548-73-2)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 26-36
• WGK Germany: 3
• F: 8
• TSCA: Yes
• HazardClass: 9
• Hazardous Substances Data: 21548-73-2(Hazardous Substances Data)

Usage

Description

Silver sulfide, also known as argentite, is a grayish-black compound with an orthogonal crystal structure or powder form. It has a density of 7.23 g/cm3, a Moh's hardness of 2.3, and melts at 825°C. Silver sulfide is insoluble in water and alcohol but soluble in sulfuric and nitric acids. It occurs naturally as the mineral argentite and is known for its stability and various applications across different industries.

Uses

Used in Photography:
Silver sulfide is used as a photosensitizer in the photography industry. It plays a crucial role in the development of silver-based images by toning them with sulfides, resulting in a stable and high-quality final product.
Used in Chemical Research and Intermediates:
In the field of chemical research, silver sulfide serves as an essential intermediate for various chemical reactions and processes. Its unique properties make it a valuable compound for further exploration and development in the chemical industry.
Used in Ceramics:
Silver sulfide is also utilized in the ceramics industry, where it contributes to the enhancement of the final product's quality and appearance. Its stability and properties make it a suitable additive for ceramic materials.
Used in Metalwork and Inlaying:
In the art of niello metalwork, silver sulfide is employed for inlaying, adding a distinctive touch and aesthetic appeal to the final product. Its unique color and properties make it a popular choice for this application.

Preparation

Mineral argentite is mined from mineral deposits, crushed, ground, and washed for use. In the laboratory, silver sulfide is obtained by passing hydrogen sulfide gas through a solution of silver nitrate. The precipitate is washed with hot water.

InChI:InChI=1/2Ag.S/rAg2S/c1-3-2