Description

Sodiumthiosulphateanhydrousar CAS NO 7772-98-2 is a high-purity, anhydrous form of sodium thiosulfate, a versatile inorganic salt. It is valued for its powerful reducing and complexing properties, making it a critical reagent in numerous industrial and analytical processes. This product is essential for manufacturers and laboratories in sectors such as photography, water treatment, analytical chemistry, and pharmaceuticals.

Application

• Photographic Fixing Agent: The primary use, to dissolve unexposed silver halides from photographic film and paper.
• Water Dechlorination: Neutralizes chlorine and chloramines in municipal and industrial wastewater treatment.
• Analytical Chemistry (Iodometry): A standard titrant for the quantitative analysis of iodine and other oxidizing agents.
• Pharmaceuticals: Used in certain formulations and as an antidote for cyanide poisoning.
• Leather & Textile Processing: Acts as a reducing agent and antichlor in bleaching and dyeing processes.
• Gold Mining: Employed in the extraction of gold from ore as an alternative to cyanide.
• Chemical Synthesis: Serves as a sulfur source and reducing agent in various organic and inorganic syntheses.

Basic Information

Product Name	Sodiumthiosulphateanhydrousar CAS NO 7772-98-2
CAS No.	7772-98-2
Molecular Formula	Na2S2O3
Molecular Weight	158.11 g/mol
Synonyms	Sodium Thiosulfate, Anhydrous; Sodium Hyposulfite; Disodium Thiosulfate; Thiosulfuric Acid, Disodium Salt; Antichlor; "Hypo"; Sodium Thiosulphate; Na2S2O3
EINECS	231-867-5

Quality Control

Our Sodium Thiosulfate Anhydrous is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for analytical and industrial applications. A Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and should be kept away from strong acids and oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (Na2S2O3)	≥ 99.0%
pH (5% solution)	6.0 - 8.0
Water Insoluble Matter	≤ 0.01%
Sulfate (SO4)	≤ 0.05%
Sulfide (S)	≤ 0.001%
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.