Sodium Thiosulphate Pentahydrate 99%

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Stock Availability

On Shelf - Approx. UK delivery date: Friday the 04th April 2025*

In bulk stock - ships within 4 - 8 Days (Excluding weekends and public holidays)

4 - 6 Weeks Approx.

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

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

Sodium thiosulfate (Na2S2O3), also spelled sodium thiosulphate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O35H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite.

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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Code	Pack	Price
SCSODTHIO5-FOIL-100G	100g Foil Pouch	£4.35
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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