Sodium Thiosulfate Formula

Sodium Thiosulfate is an inorganic compound that has a chemical formula Na2S2O3. It consists of two sodium (Na+) cations and a positively charged thiosulfate ion (S2O3). Sodium thiosulfate can be prepared by heating sulfur with sodium sulfite solution.

\(6NaOH+4S\rightarrow Na_2S_2O_3+2Na_2S+3H_2O\)

The other names of sodium thiosulfate are sodium hyposulfite, hyposulphite of soda. In this short piece of article, we will be looking more into the sodium thiosulfate formula, its chemical structure along with its properties and uses.

Sodium Thiosulfate Properties

Properties of Sodium Thiosulfate
Name Sodium Thiosulfate
Also Known as Thiosulfuric acid, Sodium Hyposulfite
Appearance and odour White crystals

Odour – Odourless

Molecular Formula Na2S2O3
Melting Point 48.3 °C (pentahydrate)
Boiling Point 100 °C (pentahydrate)
Density 1.67 g/cm³
Molar Mass 158.11 g/mol (anhydrous)

248.18 g/mol (pentahydrate)

Solubility in Water Soluble

Sodium Thiosulfate Chemical Structure

Sodium Thiosulfate Formula

Sodium Thiosulfate Uses

  • Used in several pharmaceutical products
  • Used in gold extraction
  • Its application also lies in leather tanning, photographic processing and water treatment

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