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Sodium Thiosulfate Pentahydrate

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Mumbai, JNPT, Nhava Seva, Pirpav Jetty, Ballard Pier, Mumbai Port Trust, Butcher Island, ONGC EMR Shed, MIdc, Pune, Maharastra
Detergent & Soap-12
Generic Name: 
Dechlorination Powder
Sodium Thiosulfate used as a Pond / Aquarium Dechlorinator. This product also used as a Photography as a fixing agent (hypo) to dissolve unchanged silver salts from exposed negatives.
Product Description: 

Sodium Thiosulfate commonly used in Dechlorination of municipal wastewater, pulp & paper, power, and textile water treatment plants and as an Oxygen scavenger in oil well drilling process in Mining industries. Also chemically suitable for Aluminium cation reaction.

Sodium Thiosulfate used as a Pond / Aquarium Dechlorinator.  But Sodium Thiosulfate does not treat for Chloramine, only Chlorine. Chloramine is a chemical compound composed of chlorine and ammonia and more and more utilities are converting to its use. Check with your municipal water company to learn which chemical they are using. If Chloramine is the disinfectant, please research other knowledgeable sources to learn your best solution for water treatment.

Molecular Formula  ::: Na2S2O3 - 5H2O

This product also used as a Photography as a fixing agent (hypo) to dissolve unchanged silver salts from exposed negatives.

Product Application: 

Dechlorination in municipal, pulp & paper, power, and textile water treatment plants, Oxygen scavenger – oil well drilling process  Mining industries Aluminum cation reaction

Industrial production and laboratory synthesis

On an industrial scale, sodium thiosulphate is produced chiefly from liquid waste products of sodium sulphide or sulphur dye manufacture.In the laboratory, this salt can be prepared by heating an aqueous solution of sodium sulphite with sulphur.

Principal reactions and applications

Thiosulfate anion characteristically reacts with dilute acids to produce sulfur, sulfur dioxide and water-

1.Na2S2O3 + 2HCl →2NaCl + S + SO2 + H2O

This reaction is known as a "clock reaction", because when the sulfur reaches a certain concentration the solution turns from colourless to a pale yellow. This reaction has been employed to generate colloidal sulfur. When the protonation is conducted at low temperatures, H2S2O3 (thiosulfuric acid) can be obtained. It is a somewhat strong acid with pKas of 0.6 and 1.7 for the first and second dissociation respectively.


In analytical chemistry, the most important use comes from the fact that the thiosulfate anion reacts stoichiometrically with iodine, reducing it to iodide as it is oxidized to tetrathionate:


Photographic processing

The terminal sulfur atom in S2O32− binds to soft metals with high affinity. Thus, silver halides, e.g. AgBr, typical components of photographic emulsions, dissolve upon treatment with aqueous thiosulfate:

2 S2O32− + AgBr →[Ag(S2O3)2]3−+ Br−

In this application to photographic processing, discovered by John Herschel and used for both film and photographic paper processing, the sodium thiosulfate is known as a photographic fixer, and is often referred to as hypo, from the original chemical name, hyposulphite of soda.

Gold extraction

Sodium thiosulfate is one component of an alternative lixiviant to cyanide for extraction of gold.[3] It forms a strong complex with gold(I) ions, [Au(S2O3)2]3−. The advantage of this approach is th

2 S2O32−(aq) + I2(aq) →S4O62−(aq) + 2 I−(aq)

Due to the quantitative nature of this reaction, as well as the fact that Na2S2O3•5H2O has an excellent shelf-life, it is used as a titrant in iodometry. Na2S2O3•5H2O is also a component of iodine clock experiments.

This particular use can be set up to measure the oxygen content of water through a long series of reactions. It is also used in estimating volumetrically the concentrations of certain compounds in solution (hydrogen peroxide, for instance) and in estimating the chlorine content in commercial bleaching powder and thiosulfate is essentially non-toxic and that ore types that are refractory to gold cyanidation (e.g. carbonaceous or Carlin type ores) can be leached by thiosulfate. Some problems with this alternative process include the high consumption of thiosulfate, and the lack of a suitable recovery technique, since [Au(S2O3)2]3− does not adsorb to activated carbon, which is the standard technique used in gold cyanidation to separate the gold complex from the ore slurry.

Product Procedure: 
Product Note: 
Product Technical Specification: 
IUPAC name :Sodium thiosulfate

Other names:Sodium hyposulfite, Hyposulphite of soda

 Identifiers CAS number : 7772-98-7 Y, 10102-17-7 : (pentahydrate)


ChEMBL CHEMBL : 1201157 N

RTECS number :XN6476000

Molecular Formula


Molar Mass

158.11 g/mol


white crystals




1.667 g/cm3

Melting Point

48.3 °C (pentahydrate)

Boiling Point

100 °C (pentahydrate, - 5H2O decomp)

Solubility in Water

76.4 g/100 g H20(20 °C)


IUPAC name :Sodium thiosulfate
Other names:Sodium hyposulfite ,Hyposulphite of soda


CAS number : 7772-98-7 Y,

10102-17-7 : (pentahydrate)

PubChem: 24477

ChemSpider :22885 Y


ChEMBL CHEMBL : 1201157 N

RTECS number :XN6476000

Product pack size: 
Powder form can be customized in 250, 500 Gram to 1, 5, 10, 20, 50 Kg Available in Kandla, Mundra, Mumbai, Manglore, Chennai, Visakhapatnam, Kolkata, Fujairah, Dubai - Middle East
Product alias: 
Chlorine control, Declor-it, Disodium thiosulfate, S-hydril, Sodium hyposulfite, Sodium oxide sulfide, Antichlor, Sodothiol, Sulfothiorine, Ametox