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Sodium thiosulfate (Na2S2O3), also spelled sodium thiosulphate, is an inorganic compound that is typically available as the pentahydrate, Na2S2O3·5H2O. The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water. It is also called sodium hyposulfite or “hypo”.
Basic Info
Numbering system
Properties
Safety Info
Basic Info
Chemical Name | sodium thiosulfate pentahydrate |
CAS No. | 10102-17-7 |
Molecular Formula | H10Na2O8S2 |
Molecular Weight | 248.18400 |
PSA | 149.81000 |
LogP | 0.18830 |
Numbering system
PubChem number | 24899719 |
MDL number | MFCD00149186 |
EINECS number | 231-867-5 |
RTECS number | WE6660000 |
Properties
Appearance & Physical State | translucent crystals or white powder |
Density | 1.729 |
Boiling Point | 100ºC |
Melting Point | 48.5ºC |
Water Solubility | 680 g/L (20 ºC) |
Stability | Stable. Incompatible with strong acids, iodine, mercury. |
Storage Condition | Store at RT. |
Safety Info
RTECS | WE6660000 |
Safety Statements | S24/25 |
HS Code | 28323000 |
WGK Germany | 1 |
Risk Statements | R36/37/38 |
Hazard Codes | Xi |
Used for dechlorination of hydrogen chloride in natural gas, naphtha, syngas, hydrogen and nitrogen to protect downstream catalysts from toxicity. If the gas contains organochlorine, it should be converted to hydrogen chloride by a cobalt-molybdenum hydrogenation catalyst before the dechlorinator is used to absorb the hydrogen chloride.
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