Sodium Thiosulphate Pentahydrate 99%

£8.21 to £35.23

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Variation ID		Product Code	Pack Size	List Price
7678	photo_camera	GPC5273-5X	500g GPC5273-5X	£8.21
7679	photo_camera	GPC5273-Y	1Kg GPC5273-Y	£10.86
7680	photo_camera	GPC5273-2.5Y	2.5Kg GPC5273-2.5Y	£18.69
7681	photo_camera	GPC5273-3Y	3Kg GPC5273-3Y	£21.22
7682	photo_camera	GPC5273-5Y	5Kg GPC5273-5Y	£35.23

What is Sodium Thiosulphate? It is an inorganic compound with the formula Na₂S₂O₃·(H₂O)x. Typically it is available as the white or colourless pentahydrate (x = 5), which is a white solid that dissolves well in water. The compound is a reducing agent and a ligand, and these properties underpin its applications.

Consistent Quality: We provide only high-quality Sodium Thiosulphate Pentahydrate, ensuring reliable and consistent performance for all applications.

Shipped from Manchester, UK Facility: Sourced and packaged in non-toxic, chemical-resistant containers to ensure safe handling and preserve product quality during transport.

Frequent Uses

Water Treatment
It is used to dechlorinate tap water, remove excess chlorine from swimming pools after super-chlorination, and treat wastewater before discharge into the environment.

Photography
Acts as a fixer, dissolving unexposed silver salts in photographic development.

Gold Extraction
Used in the mining industry to extract gold by forming a soluble complex with gold ions.

Analytical Chemistry
Employed as an analytical reagent in laboratories.

As a component in hand warmers and other chemical heating pads that produce heat by exothermic crystallisation of a supercooled solution.
In bleach
In pH testing of bleach substances.
To dechlorinate tap water for aquariums or treat effluent from waste water treatments prior to release into rivers. The reduction reaction is analogous to the iodine reduction reaction. Treatment of tap water requires between 0.1 grams and 0.3 grams of pentahydrated (crystalline) sodium thiosulfate per 10 liters of water.
To lower chlorine levels in swimming pools and spas following super chlorination.
To remove iodine stains, e.g. after the explosion of nitrogen triiodide.
In bacteriological water assessment.
In the tanning of leather.
To demonstrate the concept of reaction rate in chemistry classes.
To demonstrate the concept of supercooling in physics classes. Melted sodium thiosulphate is very easy to overcool to room temperature and when crystallisation is forced, the sudden temperature jump to 48.3 deg C can be experienced by touch.
As part of patina recipes for copper alloys.
Often used in pharmaceutical preparations as an anionic surfactant to aid in dispersion.
It can also be used as a very interesting solute in supersaturation experiments.
As an ingredient to table salt
Gold Extraction
Antidote to cyanide poisoning
Photographic processing

Assay: >99.0%
MF: Na₂S₂O₃•5H₂O
MW: 248.19 g/mol
MP: 48°C
Transmission: > 85%
pH 10% m/m at 25˚C: 6.5—9.0
Crystal size 0.00-3.15 (%mm): >75
Sulphite as Na₂SO₃•5H₂O (%m/m): < 5%
Sodium Sulphide: < 0.002 %w/w
Iron: < 0.0005 %w/w
Heavy metals as Pb: < 0.001 %w/w
Alkali earths as Ca: < 0.2 %m/m