| Identification | More | [Name]
BARIUM THIOSULFATE | [CAS]
35112-53-9 | [Synonyms]
BARIUM THIOSULFATE
thiosulfuricacid(h2s2o3),bariumsalt(1:1)
Barium thiosulfate hydrate
barium thiosulphate
Bariumthiosulfatewhitepowder
Bariumthiosulfate,98%
Barium hyposulfite
Thiosulfuric acid barium salt | [EINECS(EC#)]
252-375-7 | [Molecular Formula]
BaO3S2 | [MDL Number]
MFCD00040661 | [Molecular Weight]
249.46 | [MOL File]
35112-53-9.mol |
| Chemical Properties | Back Directory | [Appearance]
White, crystalline powder.Slightly soluble in water; insoluble in alcohol. | [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 | [Uses]
Explosives, luminous paints, matches, varnishes, photography. | [CAS DataBase Reference]
35112-53-9(CAS DataBase Reference) | [EPA Substance Registry System]
Thiosulfuric acid (H2S2O3), barium salt (1:1) (35112-53-9) |
| Hazard Information | Back Directory | [Chemical Properties]
White, crystalline powder.Slightly soluble in water; insoluble in alcohol. | [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. | [Purification Methods]
It is very slightly soluble in water and is washed repeatedly with chilled water and dried in air at 40o. |
| Safety Data | Back Directory | [Hazard Codes ]
Xn | [Risk Statements ]
R20/22:Harmful by inhalation and if swallowed . | [Safety Statements ]
S28:After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) . | [RIDADR ]
UN 1564 6.1/PG 3
| [WGK Germany ]
1
| [TSCA ]
Yes | [HazardClass ]
6.1 | [PackingGroup ]
III |
|
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