SODIUM THIOSULFATE PENTAHYDRATE 99%, kg

Parameter	Attribute
Sodium thiosulfate	Sodium hyposulfite
Formula	Na2S2O3·5H2O
Structure
IUPAC	sodium thiosulfate
INCI	SODIUM THIOSULFATE
CAS	10102-17-7
Molar mass	248.18 g/mol
Density	1.667 g/cm3
Solubility	In water: 70.1 g/100 mL (20 °C) 231 g/100 mL (100 °C)

Sodium thiosulfate, also known as sodium hyposulfite, is an organic salt with a wide range of applications.

In water treatment, sodium thiosulfate is used to remove chlorine from drinking water, in swimming pools, spas, aquariums, or in the treatment of industrial wastewater before it is discharged into natural waters. When measuring pH in bleach, sodium thiosulfate neutralizes free chlorine, thus eliminating the effect of pigment degradation and allowing indicators to show the pH of solutions. Sodium thiosulphate neutralizes active bromine by the same principle. Sodium thiosulphate is most commonly used in laboratories where strong oxidizing agents are handled and it is desired to neutralize them safely after the work.

In metalworking, sodium thiosulfate and ammonium thiosulfate are alternative compounds to cyanide salts in the gold recovery process. The thiosufate ion forms strong and water-soluble complex compounds with gold ions. The advantage of sodium thiosulfate is its non-toxicity and the binding of gold in ores where cyanide salts are not effective. The disadvantages are that its consumption is quite high and it is virtually non-regenerative after use.

In photography, sodium thiosulfate is used to dissolve silver halides to produce photographic emulsions. Sodium thiosulfate is also used in both photographic and cinematographic film production.

In cosmetics, sodium thiosulfate is used as a stabilizer for products with biologically active ingredients. Products with enzymes remain active longer because sodium thiosulfate binds oxygen well and prevents ageing of active enzymes. INCI listed function: Reduction: changes the chemical nature of another substance by adding hydrogen or removing oxygen.

In medicine, sodium thiosulfate is used as an antidote for cyanide poisoning. It is also used in the treatment of foot fungus, and in the treatment of some side effects after haemodialysis and chemotherapy.

In analytical chemistry, sodium thiosulfate is used for iodometric titration. Sodium thiosulfate reduces free iodine to the iodide ion, thereby changing the color of the solution and allowing the concentration of free iodine to be determined. This method allows accurate determination of peroxides and hypochlorites in both industrial and household detergents.

In school experiments, sodium thiosulfate is used as one of the components in the 'iodine clock' experiment.

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