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Sodium Thiosulphate Pentahydrate 99%

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Price: £4.35

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Stock Availability

On Shelf - Approx. UK delivery date: Tuesday the 29th July 2025*

In bulk stock - ships within 10 - 15 Working Days (Excluding weekends and public holidays)

4 to 6 weeks approx. (Not guaranteed)

UK Shipping

We can only ship to Northern Ireland where a Royal Mail postal option has been chosen at checkout.

We can only ship to the following postcodes where a Royal Mail postal option has been chosen at checkout.

AB, DD, DG3, DG4, DG6 - DG9, EH, FK, G, HS, IM, IV, KA, KW, KY, ML, PA, PH, PO30 - PO41, TD, TR21 - TR25, ZE

* We will always try to ship as early as possible. Delivery could be much quicker than stated but is not guaranteed

Applications

As a component in hand warmers and other chemical heating pads that produce heat by exothermic crystallization 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 thiosulfate is very easy to overcool to room temperature and when crystallization 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

General

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.

Specification

Minimum Assay: >99.0%
Molecular Formula: Na2S2O3•5H₂O
Molecular Weight: 241.17 g/mol
Solubility in water (% weight): 79g/100 ml water @ 40 C
Melting Point: 48 °C
Calcium (Ca): <0.30%
Iron (Fe): <10ppm
Heavy Metals (as Pb): <10ppm
Acidity: <0.01%
Alkalinity: <0.06%

Hazards

Hazard Phrases: Not considered harmful under normal laboratory conditions

Cas No: 10102-17-7

Einecs No: 231-867-5

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GPC5273-5X	500g	£6.88
SCSODTHIO5-FOIL-2X100G	2 x 100g	£4.45
SCSODTHIO5-FOIL-250G	250g Foil Pouch	£4.90
SCSODTHIO5-FOIL-2X250G	2 x 250g	£7.95
SCSODTHIO5-FOIL-500G	500g Foil Pouch	£5.78
SCSODTHIO5-FOIL-2X500G	2 x 500g	£11.95
SCSODTHIO5-1KG	1Kg	£9.30
SCSODTHIO5-2X1KG	2 x 1Kg	£17.95
SCSODTHIO5-2.5KG	2.5Kg	£16.45
SCSODTHIO5-2X2.5KG	2 x 2.5Kg	£39.95
SCSODTHIO5-5KG	5Kg	£32.95
SCSODTHIO5-2X5KG	2 x 5Kg	£59.95
SCSODTHIO5-25KG	25Kg	£126.50

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