Sodium Thiosulfate, Formula, Chemical Properties, Preparation, Uses

Sodium Thiosulfate

Sodium thiosulfate is an inorganic compound that has consists of sodium as cations and sulfate as anions. It is a white or colourless and dissolves well in the water. it interacts with the single bonded atoms which is called as the electronic configuration. These electrons are replaced or exchanged the atoms from their substances. sodium thiosulfate also neutralizes the colour removing effects and increased the level of pH in the liquid solutions. The systematic IUPAC name is known as sodium thiosulfate . The chemical or molecular formula of sodium thiosulfate is Na2S2O3. The other names of sodium thiosulfate is sodium hyposulfite or hyposulfite of soda.

Structural Formula

This is the structural formula of the sodium thiosulfate:

Sodium Thiosulfate

Chemical Formula

The chemical formula of the sodium thiosulfate is Na2S2O3.

Preparation method

When the sodium hydroxide is reacted with the sulfur at the given boiling point it produced the sodium thiosulfate. Sodium sulfide and water gives as an byproduct. In the laboratory process, it has produced the sodium thiosulfate by heating the solutios in the aqueous form.  When it is heated at the temperature of 300C it decomposed or converted to sodium sulfate and sodium polysulfide.

Learn More:   Barium Nitrate, Formula, Chemical Properties, Preparation, Uses

6 NaOH + 4S → Na2s2O3 + 2Na2S + 3H2O

Physical Properties

Melting point 48.3C
Boiling point 100C
Molecular weight 158.11g/mol
Density 1.667g/cm3
Solubility in water Soluble
Refractive index 1.489
Crystal structure Monoclinic
Appearance White crystals
Odor Odourless
Solubility Negligible in alcohol

Chemical Properties

Sodium thiosulfate is a non inflammable substances and also more hazardous to the environment. The melting and boiling point is very low. It is monoclinic in structure. The range of the refractive index is less than 10. It looks like a white crystals in the appearance. It is soluble in water and bitter in taste.


Sodium sulfate is used in the treatment of cyanide poisoning agent. It is medically cured for dermatophytosis. It is very important for analytical chemistry. Sodium thiosulfate salts used for photographic fixers.



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