Sodium Hydrosulfide

Description:

Chemical Formula: Na2S2O3

Physical Appearance: Sodium thiosulfate is usually found as a colorless, crystalline solid.

Solubility: Highly soluble in water.

Melting Point: Around 48.3 °C (119 °F) (anhydrous), 48.5 °C (119.3 °F) (pentahydrate)

Density: Varies depending on the form, typically around 1.67 g/cm³ (pentahydrate)

Specification:

Purity: Commercially available sodium thiosulfate is typically offered with purities ranging from 95% to 99%.

Concentration: Solutions of sodium thiosulfate are commonly available in various concentrations.

Impurities: Common impurities may include traces of heavy metals, sulfates, and chlorides.

Packaging: It is often packaged in bags, drums, or other containers suitable for storage and transportation.

Application:

Photography: Sodium thiosulfate is extensively used in the photographic industry as a photographic fixer. It helps to remove unexposed silver halide from photographic film or paper following development, preventing further exposure and stabilizing the image.

Water Treatment: It is employed in water treatment processes to dechlorinate tap water and wastewater. Sodium thiosulfate can neutralize chlorine and chloramine, which are commonly used disinfectants in water treatment, to make water safe for aquatic life and other sensitive applications.

Medical Use: In medicine, sodium thiosulfate can be used as an antidote to cyanide poisoning. It works by converting cyanide to thiocyanate, a less toxic compound that can be excreted through urine.

Analytical Chemistry: Sodium thiosulfate finds applications in analytical chemistry as a titrant in iodometry to determine the concentration of substances such as chlorine, bromine, and iodine.

Gold Extraction: It is used in gold mining as part of the cyanide leaching process to dissolve gold and silver from ores.

Textile Industry: Sodium thiosulfate can be utilized in the textile industry for removing excess chlorine after bleaching processes.

Cosmetics: In cosmetics, it can be used in hair products to neutralize the residual effects of hair dyes and bleach.

Oil and Gas Industry: Sodium thiosulfate is used for various applications in the oil and gas industry, including hydrogen sulfide scavenging and reducing agent in sulfur removal processes.

These are some of the primary applications of sodium thiosulfate, highlighting its importance across multiple industries.