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Sodium Thiosulfate

Sodium Thiosulfate

Basic Information

CAS No.: 7772-98-7
Molecular Formula: Na2O3S2
Molecular Weight: 158.11

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Product Details

Sodium Thiosulfate is a colorless crystalline compound, soluble in water with weak reducibility. It is widely used as a dechlorinating agent in water treatment, a fixing agent in photographic processing, a detoxifier in medical applications, and as a bleaching and dechlorination agent in textile and paper industries.


Chemical Properties

PropertyValue

Melting point

48°C

Boiling point

100°C

Bulk density

1350kg/m3

Density

1.01 g/mL at 25 °C

Storage temp.

Store at +5°C to +30°C.

Solubility

Immiscible with alcohol.

Form

Solid

Specific Gravity

1.667

Color

White

PH

6.0-8.5 (25℃, 50mg/mL in H2O)

Water Solubility

Soluble in water. Insoluble in alcohol.

Sensitive

Hygroscopic

Merck

14,8694

Stability:

Stable. Incompatible with strong acids, strong oxidizing agents, iodine, mercury.

InChIKey

AKHNMLFCWUSKQB-UHFFFAOYSA-L

LogP

-0.428 (est)

CAS DataBase Reference

7772-98-7(CAS DataBase Reference)

EPA Substance Registry System

Sodium thiosulfate (7772-98-7)


Safety Information

PropertyValue

Hazard Codes

Xi

Risk Statements

36/37/38

Safety Statements

24/25-23-36-26

WGK Germany

1

RTECS

XN6476000

F

3

TSCA

Yes

HS Code

28323000

Hazardous Substances Data

7772-98-7(Hazardous Substances Data)

Toxicity

LD50 orally in Rabbit: > 5000 mg/kg


Product Usage

Sodium Thiosulfate, commonly known as Hypo, is a versatile inorganic salt with diverse functional applications. In the photography industry, it serves as a classic fixing agent to dissolve unexposed silver halides from films. In water treatment, it is a highly effective dechlorinating agent, widely used to neutralize residual chlorine in tap water or industrial effluent to protect aquatic life. In the medical field, it acts as an indispensable antidote for cyanide poisoning and is used to mitigate the side effects of certain chemotherapy drugs. Furthermore, it is extensively applied in the textile and paper industries for bleaching dechlorination, in leather tanning, and in hydrometallurgy for extracting gold and silver from ores.

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