Sodium Thiosulphate Extra Pure

Description

Sodium thiosulfate, also known as sodium thiosulphate, is an inorganic compound with the formula Na₂S₂O₃. The “extra pure” grade indicates a high purity level, making it suitable for various analytical and laboratory applications.

Physical Properties:

• Appearance: White crystalline powder.

• Molecular Weight: 158.11 g/mol.

• Melting Point: Approximately 48°C.

• Density: 1.66 g/cm³.

• Solubility: Highly soluble in water (700 g/L at 20°C); practically insoluble in alcohol.

Chemical Properties:

• pH: A 5% aqueous solution has a pH ranging from 6.0 to 8.5.

• Assay (Purity): Minimum 98.5% on a dry basis.

Applications:

• Analytical Chemistry: Used as a reducing agent in iodometric titrations.

• Photography: Serves as a fixer to dissolve unexposed silver halides from photographic emulsions.

• Medical Treatments: Employed in cyanide poisoning antidote kits and to reduce cisplatin-induced hearing loss.

• Water Treatment: Neutralizes chlorine in water treatment processes and aquariums.

Safety Information:

Sodium thiosulfate is generally considered to have low toxicity. However, appropriate safety measures should be taken to avoid inhalation, ingestion, or contact with skin and eyes.

When handling sodium thiosulfate extra pure, it is essential to follow standard laboratory safety protocols, including the use of personal protective equipment and proper storage conditions.