Sodium Hydrosulfide, CAS 16721-80-5, is an off-white solid with the molecular formula HNaS and a molecular weight of 56.06. It is highly soluble in water, with a water solubility of approximately 620 g/L at 20°C, and is also soluble in ethanol and ether. The material has a characteristic sulfur-like odor and is commonly supplied for controlled industrial and laboratory applications.

This moisture-sensitive, hygroscopic substance should be stored in a tightly sealed container in a cool, dry, well-ventilated area. Handle only with suitable protective equipment and follow the applicable safety data sheet and local regulations. Keep away from heat, ignition sources, moisture, and incompatible materials, and use appropriate procedures for transport, storage, and disposal.