BARIUM THIOSULFATE Chemical Properties

Melting point:

decomposes at 220℃ [CRC10]

Density 

3.45

solubility 

insoluble in ethanol

form 

white crystalline powder

color 

white crystals, crystalline powder

Water Solubility 

insoluble EtOH; 0.220 g/100g H2O [CRC10]

Merck 

13,1002

Solubility Product Constant (Ksp)

pKsp: 4.79

Exposure limits

ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3

CAS DataBase Reference

35112-53-9(CAS DataBase Reference)

EPA Substance Registry System

Thiosulfuric acid (H2S2O3), barium salt (1:1) (35112-53-9)

Safety Information

Hazard Codes 

Xn

Risk Statements 

20/22

Safety Statements 

28

RIDADR 

UN 1564 6.1/PG 3

WGK Germany 

1

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

BARIUM THIOSULFATE Usage And Synthesis

Description

Barium thiosulfate has the molecular formula of BaS₂O₃ and the molecular weight of 249.4602 g/mol. It can be prepared by the reaction of sodium thiosulfate in water with the chloride of barium:
BaCl2+Na2S2O3 ? BaS2O3+2NaCl
It is not very soluble in water (0.25 g/100 ml at 15°C) so that the solution does not need to be evaporated at a low temperature to crystallize the product. A monohydrate is the result. BaS₂O₃·H₂O has the CAS number of 35112-53-9. It is insoluble in ethanol. It is a white, crystalline, water-insoluble, poisonous solid. It loses the water of hydration at 110°C and decomposes at 228°C to form the sulfate, sulfur and SO₂.
BaS₂O₃·H₂O is used chiefly in the manufacture of explosives, matches, paints, and varnishes. However,the demand for this chemical is not substantial and it is classified as a “rare” chemical.

Chemical Properties

White, crystalline powder.Slightly soluble in water; insoluble in alcohol.

Uses

Barium thiosulfate (BaS2O3) is mainly used in explosives, matches, varnishes, and photography.

Uses

Explosives, luminous paints, matches, varnishes, photography.

Purification Methods

It is very slightly soluble in water and is washed repeatedly with chilled water and dried in air at 40o.

BARIUM THIOSULFATE(35112-53-9)Related Product Information

• SODIUM TETRATHIONATE DIHYDRATE
• BARIUM SULFIDE
• SILVER BROMIDE
• Potassium chromate
• calcium bicarbonate
• Magnesium thiosulfate hexahydrate
• CALCIUM THIOSULFATE
• STRONTIUM THIOSULFATE
• Radium Pyrosulfate
• Beryllium Pyrosulfate
• Calcium Pyrosulfate
• Beryllium Thiosulfate
• Radium Thiosulfate
• Barium sulfite
• BARIUM THIOSULFATE
• BARIUM HYDRIDE
• Barium sulfate
• BARIUM THIOSULFATE H2O,BARIUM THIOSULFATE MONOHYDRATE