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Sodium Thiosulfate Pentahydrate BP USP FCC Food ACS Reagent Grade Supplier and Manufacturers' Represantative

CAS: 10102-17-7; EINECS: 231-867-5; Molecular Weight: 248; Formula : Na2S2O3.5H2O

FInOrIC, etymologically derived from our business line of Fine Inorganic, Organic and Industrial Chemicals, is the internationally preferred source for Chemicals. With customers in 55 countries across 5 continents, we source and sell most chemicals. Backed by company owned & operated full-fledged chemical manufacturing facilities in Midland & Houston, Texas with associated manufacturing sites in India, Dubai and China we are a truly multi-national chemical manufacturer and distributor.

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Sodium Thiosulfate Manufacturers BP USP FCC Food Grade
MSDS of Sodium Thiosulfate Pentahydrate Manufacturers
Sodium Thiosulfate Thiosulphate Anhydrous

Spanish Sodio tiosulfato pentahidrato anhidro

Sodium Thiosulfate Pentahydrate
Technical & Pure Sodium Thiosulphate Pentahydrate
Also BP USP FCC Food ACS Reagent Grade Suppliers

Sodium Thiosulfate Pentahydrate; Sodium Thiosulfate Pea Crystals

Sodium thiosulfate (Na2S2O3), also spelled Sodium thiosulphate, or thio sulphate is a colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3•5H2O. It is an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo”.

The thiosulfate anion is tetrahedral in shape and is notionally derived by replacing one of the oxygen atoms by a sulfur atom in a sulfate anion. The S-S distance indicates a single bond, implying that the sulfur bears significant negative charge and the S-O interactions have more double bond character. The first protonation of thiosulphate occurs at sulfur.

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

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 colorless 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 strong acid pKa.

Sodium Thiosulfate Pea Crystals, Pentahydrate Sodium Thiosulfate Manufacturers:

ITC-HSN Code: 2832 30 10
CAS: 10102-17-7 (7772-98-7 Anhydrous)
Formula : Na2S2O3.5H2O
Molecular Weight: 248
Appearance: White Crystalline

Sodium Thiosulfate Pure

Parameters Specifications
Appearance White Uniform Crystals (10 mesh)
pH of 10% Aqueous Solution 6.5 to 8
Assay 99% minimum
Sulphites & Sulphates 0.2% max
Heavy Metals Less than 5 ppm
Iron Less than 10 ppm

Sodium Thio Sulfate Photographic P4 & P8

Parameters Specifications
Appearance Cylindrical Pellets (5 mm to 10 mm for P4 ) & (2 mm to 5 mm for P8)
pH of 10% Aqueous Solution 6.5 to 8
Assay 99.5% minimum
Sulphites & Sulphates 0.2% max
Heavy Metals Less than 3 ppm
Iron Less than 5 ppm

We can give both the grades Pentahydrate and Anhydrous. We can give the technical grade small crystals and large crystals too.

We also offer Sodium Thiosulfate BP, Ph. Eur. and Sodium Thiosulfate Extra Pure from a world class FDA approved, ISO-9001-2008, ISO-22000-2005 HACCP Certified facility with Kosher & Halal approval.

Sodium Thiosulfate USP Grade Specifications
Na2S2O3·5H2O 248.19
Contains not less than 99.0 percent and not more than 100.5 percent of Na2S2O3, calculated on the anhydrous basis.

A: To a solution (1 in 10) add a few drops of iodine TS: the color is discharged.
B: A solution (1 in 10) responds to the tests for Sodium and for Thiosulfate.
Water: Dry about 1.0 g, accurately weighed, in vacuum at 40 o to 45o for 16 hours: it loses between 32.0% and 37.0% of its weight.
Calcium: Dissolve 1 g  Sodium Thiosulfate in 20 mL of water, and add a few mL of ammonium oxalate TS: no turbidity is produced.
Heavy metals: the limit is 0.002%.

Sodium Thiosulphate BP Grade Specifications

Content: 99.0 per cent to 101.0 per cent of Na2S2O3,5H2O.

Appearance: Transparent, colorless crystals, efflorescent in dry air.
Solubility: Very soluble in water, practically insoluble in ethanol 96 per cent. It dissolves in its water of crystallization at about 49°C.

A. It decolorizes iodinated potassium iodide solution.
B. To 0.5 ml of solution S (see Tests) add 0.5 ml of water R and 2 ml of silver nitrate solution. A white precipitate is formed which rapidly becomes yellowish and then black.
C. To 2.5 ml of solution S add 2.5 ml of water and 1 ml of hydrochloric acid. A precipitate of sulphur is formed and gas is evolved which gives a blue colour to starch iodate paper.
D. 1 ml of solution S gives reaction of sodium.

Solution S: Dissolve 10.0 g in carbon dioxide-free water R prepared from distilled water R and dilute to 100 ml with the same solvent.
Appearance of solution: The freshly prepared solution is clear and colourless.
Dissolve 10.0 g in 50 ml of distilled water, add 1 ml of 0.1 M sodium hydroxide and dilute to 100 ml with the same solvent.
pH: 6.0 to 8.4 for the freshly prepared solution S.
Sulphates and sulphites: Maximum 0.2 per cent.
Sulphides: To 10 ml of solution S add 0.05 ml of a freshly prepared 50 g/l solution of sodium nitroprusside. The solution does not become violet.
Heavy metals: Maximum 10 ppm.

Sodium Thiosulfate FCC Food Grade, US Food Chemical Codex Grade Specifications
Sodium Hyposulfite
Na2S2O3·5H2O Formula wt 248.19


Sodium Thiosulfate or Sodium Thiosulphate occurs as large, colorless crystals or as a coarse, crystalline powder. It is deliquescent in moist air and effloresces in dry air at a temperature above 33°. Its solutions are neutral or faintly alkaline to litmus. One gram dissolves in 0.5 mL of water. It is insoluble in alcohol.
Function: Sequestrant; antioxidant.


A. Add a few drops of iodine TS to a 1:10 aqueous solution. The color disappears.
B. A 1:20 aqueous solution gives positive tests for Sodium and for Thiosulfate.
Assay: Not less than 99.0% and not more than 100.5% of Na2S2O3 after drying.
Lead: Not more than 2 mg/kg.
Selenium: Not more than 0.003%.
Water: Between 32.0% and 37.0%.

Sodium Thiosulfate Pentahydrate ACS Analytical Reagent Grade Specifications
Na2S2O3 . 5H2O
Formula Wt 248.19
CAS Number 10102-17-7

Assay: 99.5-101.0% Na2S2O3-5H2O
pH of a 5% solution: 6.0-8.4 at 25C

Insoluble matter: 0.005%
Nitrogen compounds (as N): 0.002%
Sulfate and sulfite (as SO4): 0.1%
Sulfide (S): Passes test.

Sodium Thiosulfate Pentahydrate Manufacturers:

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29 March, 2018