Sodium Thiosulfate Pentahydrate, Lab Grade *


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Sodium Thiosulfate Pentahydrate, also known as Disodium Sulfurothioate Pentahydrate, and Sodium Hyposulfite Pentahydrate is a hydrate of Sodium Thiosulfate with 5 mol eq. of Water. having the chemical formula H10Na2O8S2 or Na2S2O3-5H2O. It appears as colorless to white hygroscopic crystals, chunks, or crystalline powder with no odor. It is sparingly soluble in Water and insoluble in Alcohol at ambient conditions. When heated to around 300 o C, it undergoes decomposition emitting highly toxic fumes of Disodium Oxide and Sulfur Oxides. Commercially, it is produced by reacting by-product liquid of Sodium Sulfide synthesis with Sulfur Dioxide. Chemically pure or Laboratory reagents are the two terms often used to describe Lab Grade chemicals. Lab Grade chemicals do not meet any accepted quality or purity requirements such as the ACS Grade, the USP Grade, and the FCC Grade, despite their acceptable purity. In the United States of America (USA), Lab Alley is selling its high-quality Sodium Thiosulfate, Anhydrous,Lab Grade online at Due to its high purity, this Lab Alley product is highly recommended for labs and commercial applications.


Sodium Thiosulfate Crystal Pentahydrate Features:

Assay (Anhydrous Basis) 99.0-100.5%
Water 32.0-37.0%
Appearance of Solution (10g in 100ml) Clear and Colorless
Calcium (Ca) To Pass Test
Arsenic (As) 3 ppm
Heavy Metals (as Pb) 0.002%
Lead 0.001%
Selenium 0.003%
Common Uses
  • Reagent
  • Chemical precursor
  • Chemical analysis
Commercial/industrial applications
  • Tanning of leather
  • Photographic processing
  • Synthesis of dyes
Safety and Handling

Please contact us to request a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for Sodium Thiosulfate Crystal Pentahydrate Lab grade.

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