Sodium Thiosulfate CAS 7772-98-7
Sodium Thiosulfate CAS 7772-98-7Sodium Thiosulfate CAS 7772-98-7

Sodium Thiosulfate CAS 7772-98-7

Sodium Thiosulfate CAS 7772-98-7, Sodium Thiosulfate, CAS 7772-98-7

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Molecular formula: Na₂S₂O₃ (anhydrous)/Na₂S₂O₃·5H₂O (pentahydrate),Molecular weight: 158.11 (anhydrous) / 248.18 (pentahydrate),Appearance: Colorless transparent monoclinic crystals (pentahydrate) or white crystalline powder (anhydrous), odorless and salty in taste.

7772-98-7

Na2O3S2

158.11

231-867-5

Sodium Thiosulfate CAS 7772-98-7 Information

CAS 7772-98-7
Molecular formula Na2O3S2
Molecular weight 158.11
EIENCS 231-867-5
Form /
Melting point
boling point /
Density /
Solubility Dissolves slowly in water to form a viscous solution; insoluble in ethanol and in ether.
PKA /
Color White to yellow powder
Storage temp /

Sodium Thiosulfate CAS 7772-98-7

What is Sodium Thiosulfate CAS 7772-98-7?

Molecules and Structures

Molecular formula: Na₂S₂O₃ (anhydrous)/Na₂S₂O₃·5H₂O (pentahydrate)

Molecular weight: 158.11 (anhydrous) / 248.18 (pentahydrate)

Appearance: Colorless transparent monoclinic crystals (pentahydrate) or white crystalline powder (anhydrous), odorless and salty in taste.

Solubility: Readily soluble in water (solubility at 20℃ : 210 g/L), insoluble in ethanol and ether.

Key parameters

Melting point: 48℃ (the pentahydrate melts and dissolves in crystalline water).

Boiling point: 100℃ (Decomposition).

Density: 1.667 g/cm³ (anhydrous) / 1.69 g/cm³ (pentahydrate).

Stability

It is prone to efflorescence in dry air and deliquescent in humid air.

Decomposition in strong acids: generating elemental sulfur and SO₂ (Na₂S₂O₃ + 2HCl → 2NaCl + S↓ + SO₂↑ + H₂O).

Reducing property: Can be oxidized by oxidants (such as Cl₂, I₂)

Reaction with iodine: 2Na₂S₂O₃ + I₂ → Na₂S₄O₆ + 2NaI (iodometric principle).


Sodium Thiosulfate CAS 7772-98-7 Use

Medicine and detoxification

Cyanide poisoning antidote: Under the action of thiocyanase, it combines with cyanide ions to form non-toxic thiocyanates and is excreted from the body.

Cisplatin chemotherapy side effect prevention: Approved by the FDA for the prevention of hearing loss caused by cisplatin chemotherapy in children.

Skin disease treatment: 20% to 30% solution for external application to treat pityriasis versicolor (tinea versicolor).

Industry and Environmental Protection

Fixer: Dissolves unexposed silver bromide (AgBr + 2Na₂S₂O₃ → Na₃[Ag(S₂O₃)₂] + NaBr), used in photography and film industries.

Dechlorination agent

Residual chlorine (S₂O₃²⁻ + 4Cl₂ + 5H₂O → 2SO₄²⁻ + 8Cl⁻ + 10H⁺) is removed after bleaching in the textile/paper industry.

Removal of hydrogen chloride from industrial gases such as hydrogen and syngas.

Silver ore: with silver ions to form complex (2 S ₂ O ₃ squared ⁻ + Ag ⁺ - > [Ag (S ₂ O ₃) ₂] after ⁻).

Food and daily chemicals

Food additive: As an antioxidant and chelating agent, it is used for fruit juice preservation and preventing oil oxidation in nuts (national standard superior grade product).

Cosmetics and detergents: Dechlorination and stabilizing components in shampoos and disinfectants.


Sodium Thiosulfate CAS 7772-98-7 safety

Toxicity risk

Acute toxicity: Intraperitoneal injection of LD₅₀=5600 mg/kg in mice (low toxicity), but it is irritating to the eyes, skin and respiratory tract.

Decomposition risk: It releases SO₂ (highly toxic) when exposed to strong acids. Contact with acids and oxidants should be avoided.

Operation protection

Essential equipment: Dust mask, chemical goggles, nitrile gloves.

Leakage treatment: After the sand and soil are adsorbed, they should be incinerated as hazardous waste. Flushing is strictly prohibited (to prevent SO₂ diffusion).

Storage and Transportation

Conditions: Sealed, light-proof, cool and dry (humidity ≤60%), temperature ≤25℃.

Contraindications: Do not coexist with acids, oxidants, or halogens. Transport mark: UN 3263 (Corrosives).


Deshangchemical Info

  • ● Comgpany name : Shandong Deshang Chemicals Co., Ltd.
  • ● Main products : Treatments, sedimentation agents, flame retardants, catalysts, matte pigments, talcum powder, PVC additives, antifreeze agents, cellulose, cleaning agents, coconut oil, hydroxyethyl, cosmetics, matte agents, betaine, disinfectants, photosensitizers, humidifying agents, blue pigments, curing agents, potassium formate, sodium formate, cyclohexanol, preservatives, grinding aids.
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