Sodium Hydrosulfide
Multiple Physical Forms: Supplied in block, granular, and powdered solid states to accommodate diverse industrial processing and handling needs.
Strong Alkaline Character: Aqueous solutions exhibit pronounced alkalinity, enhancing efficacy in chemical reactions requiring pH elevation or alkaline conditions.
Controlled Reactivity: Undergoes rapid reaction with acids to liberate hydrogen sulfide, enabling targeted applications in metal treatment and synthetic chemistry.
Moderate Hygroscopicity: Demonstrates moisture-absorbing properties suitable for regulated use in humidity-sensitive formulations or controlled environments.
Sodium hydrosulfide (CAS 16721-80-5) appears as colorless crystals in pure form, while industrial-grade material typically presents as light gray or yellowish solids in block, granular, or powdered forms due to impurities. The compound is hygroscopic and emits a characteristic hydrogen sulfide odor. Its aqueous solution is strongly alkaline and reacts with acids to release toxic hydrogen sulfide gas.
Parameters
Melting point | 55°C |
density | 1,79 g/cm3 |
RTECS | WE1900000 |
Fp | 90°C |
solubility | soluble in H2O, EtOh, ethyl ether |
form | Solid |
color | Off-white |
Odor | Rotten eggs odor |
Water Solubility | 620 g/L (20 ºC) |
Sensitive | Moisture Sensitive & Hygroscopic |
Stability | Stable, but hygroscopic. Flammable solid. May ignite in air. |
CAS DataBase Reference | 16721-80-5(CAS DataBase Reference) |
EPA Substance Registry System | Sodium hydrosulfide (16721-80-5) |
Safety Information
Hazard Codes | C,F |
Risk Statements | 31-34 |
Safety Statements | 25-36/37/39-45-50A |
RIDADR | 2318 |
TSCA | Yes |
HazardClass | 4.2 |
PackingGroup | II |
Hazardous Substances Data | 16721-80-5(Hazardous Substances Data) |
Sodium hydrogen sulfide finds extensive industrial application across multiple sectors. In the pulp and paper industry, it functions as a key component in chemical processing, while simultaneously serving as a desulfurizing agent in rayon and cellophane production. The compound acts as an effective bleaching agent in textile manufacturing, paper processing, and dye production. Within the leather industry, it facilitates the hide unhairing process, and in mineral processing, it operates as a flotation agent for copper ore extraction. Furthermore, it serves as an important synthetic intermediate and starting material for producing derivatives including ammonium sulfate and ethanethiol.
