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| CAS No.: | 7772-98-7 |
|---|---|
| Name: | Sodium thiosulfate |
| Molecular Structure: | |
|
|
|
| Formula: | Na2S2O3 |
| Molecular Weight: | 158.11 |
| Synonyms: | Thiosulfuric acid, disodium salt (8CI);Ametox;Antichlor;Chlorine Control;Chlorine Cure;Declor-It;Desilube 88;Disodium thiosulfate;Disodium thiosulphate;Hypo;S-Hydril;Sodiumhyposulfite; |
| EINECS: | 231-867-5 |
| Density: | 1.667 g/cm3 |
| Melting Point: | 48.°C |
| Boiling Point: | 100 °C |
| Solubility: | Soluble in water |
| Appearance: | White powder |
| Hazard Symbols: |
 Xi
|
| Risk Codes: | 36/37/38 |
| Safety: | 24/25-23-36-26 |
| PSA: | 103.66000 |
| LogP: | 0.50980 |
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Chemistry
Product Name: Sodium thiosulfate (CAS NO.7772-98-7)
MF: Na2S2O3
MW: 158.108 g/mol
Appearance: white crystals
Odor: odorless
Density: 1.667 g/cm3
MP: 48.3 °C
BP: 100 °C (decomp)
Solubility in water: 20.9 g/100 ml (20 °C)
H-Bond Donor: 0
H-Bond Acceptor: 3
Structure Descriptors of Sodium thiosulfate (CAS NO.7772-98-7):
Canonical SMILES: [O-]S(=O)(=S)[O-].[Na+].[Na+]
InChI: InChI=1S/2Na.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
InChIKey: AKHNMLFCWUSKQB-UHFFFAOYSA-L
Product Categories: Inorganics; Essential Chemicals; Reagent Plus; Routine Reagents; DetergentsSynthetic Reagents; Core Bioreagents; Research Essentials; Reference Material Potassium iodateTitration; Concentrates (e.g. FIXANAL); Salt Concentrates; S - ZSynthetic Reagents ;Salts; Sodium Salts; SodiumMetal and Ceramic Science; Inorganic Salts; Synthetic Reagents; Reference Material Potassium iodateVolumetric Solutions; Salt solutionsSynthetic Reagents; By Reference Material; S - ZTitration; Salt Solutions; Solution containers (VOLPAC); Volumetric Solutions; Hematology and Histology; Histology Special Stains
Uses
Sodium thiosulfate has many uses ,some main uses are as follows:
1.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:
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.
2.Sodium thiosulfate is one component of an alternative lixiviant to cyanide for extraction of gold. It forms a strong complex with gold(I) ions, [Au(S2O3)2]3-.
3.It is used as an antidote to cyanide poisoning. Thiosulfate acts as a sulfur donor for the conversion for cyanide to thiocyanate (which can then be safely excreted in the urine), catalyzed by the enzyme rhodanase.
4.It has also been used as treatment of calciphylaxis in hemodialysis patients with end-stage renal disease.
Production
On an industrial scale, sodium thiosulfate is produced chiefly from liquid waste products of sodium sulfide or sulfur dye manufacture. In the laboratory, this salt can be prepared by heating an aqueous solution of sodium sulfite with sulfur.
Toxicity Data With Reference
1. scu-rbt LDLo:4000 mg/kg AIPTAK Archives Internationales de Pharmacodynamie et de Therapie. 5 (1899),161.
2. scu-frg LDLo:6 g/kg AIPTAK Archives Internationales de Pharmacodynamie et de Therapie. 5 (1899),161.
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Moderately toxic by subcutaneous route. Incompatible with metal nitrates, sodium nitrite. When heated to decomposition it emits very toxic fumes of Na2O and SOx. See also Sodium thiosulfate and Sodium thiosulfate, Pentahydrate.
Hazard Codes: Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 24/25-23-36-26
S23:Do not breathe vapour.
S24/25:Avoid contact with skin and eyes.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36:Wear suitable protective clothing.
WGK Germany: 1
RTECS: XN6476000
F: 3
Hazardous Substances Data: 7772-98-7(Hazardous Substances Data)
Analytical Methods
Sodium thiosulfate is also used in analytical chemistry. It can, when heated with a sample containing aluminum cation, produce a white precipitation:
2Al3+ + 3S2O32- + 3H2O → 3SO2 + 3S + 2Al(OH)3
Specification
Sodium thiosulfate , its CAS NO. is 7772-98-7, the synonyms are Sodium hyposulfite ; Sodium subsulfite .