What Is Hydrosulfuric Acid?
Hydrosulfuric acid is a colorless liquid with an irritating odor (with acidic properties), does not directly corrode the skin, acts on the subcutaneous blood vessels, and the pain is generated subcutaneously. At high concentrations, small droplets are generated at the mouth of the container, and water is added When a large amount of heat is generated, hydrogen sulfide can be dissolved in water. Under normal circumstances, the solubility of H2S in water is 1: 2.6. The aqueous solution of hydrogen sulfide is called hydrosulfuric acid. Hydrosulfuric acid is a volatile binary weak acid, and its acidity is slightly weaker than that of carbonic acid. Hydrosulfuric acid is a solution, a mixture, containing different molecules and ions (hydrogen sulfide molecules, water molecules, hydrogen ions, sulfhydryl ions, sulfur ions, very small amounts of hydroxide ions). Hydrosulfuric acid can show acidity and reducibility, so it should not be stored for a long time in the air. Hydrogen sulfide is difficult to be oxidized by oxygen in the air at room temperature. Hydrosulfuric acid is not an electrolyte.
- Chinese name: hydrogen sulfide
- Chinese alias: Hydrogen sulfuric acid
- English name: hydrogen sulfide
- English alias: Siarkowodor; HYDROGEN SULFIDE; Hepatic gas; sewergas; H 2 S;
- CAS number: 7783-06-4
- Molecular formula: H 2 S
- Molecular weight: 34.08090
- Exact mass: 33.98770
- PSA: 25.30000
- LogP: 0.11280 [1]
- The colorless transparent odorous gas of hydrogen sulfide is slightly heavier than air. The relative density at 1.50 ° C and 1 atmosphere is 1.189 and the molecular weight is 34. Hydrogen sulfide gas is easy to gather in low-lying places. If there is a leak of hydrogen sulfide, people take self-protection measures and work in the upwind direction of natural winds and in high-lying places. Hydrogen sulfide can be dissolved in liquids, both in water and other inorganic solvents, as well as in organic solvents such as ethanol and glycerol. At 20 ° C, 1 volume of water can dissolve 2.6 volumes of hydrogen sulfide. The resulting aqueous solution is called hydrosulfuric acid with a molar concentration of 0.1 mol / L. Hydrogen sulfuric acid is stronger than hydrogen sulfide gas
- It can interact with many metal ions to form sulfide precipitates that are insoluble in water or acid. For many substances
- Danger category: 2.3
- Customs code: 2830909000
- Dangerous Goods Transport Code: UN 1053 2.3
- WGK Germany: 2
- Danger category code: R12
- Safety instructions: S9-S16-S36-S38-S45-S61
- RTECS number: MX1225000
- Dangerous goods mark: T +; F +; N [2]
- Hydrogen sulfide is soluble in water, and the solubility of H 2 S in water is usually 1 : 2.6. Water solubility of hydrogen sulfide
- drug:
- 1. Manufacture of synthetic phosphors, electroluminescence, photoconductors, photoelectric exposure meters, etc. Organic synthetic reducing agent. For metal refining, pesticide, medicine, catalyst regeneration. Universal reagent. Preparation of various sulfides.
- 2. Isolation and identification of metal ions, refined hydrochloric acid and sulfuric acid, elemental sulfur
- 3. Convert sulfur and sulfuric acid to produce sodium sulfide and sodium sulfide, or to produce organic sulfur compounds such as thiophene, thiol and thioether. [2]