Sodium Thiosulfate Pentahydrate, ACS Grade


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 whitehygroscopic 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. An ACS Grade reagent is a chemical that meets the purity requirements of the American Chemical Society. For dependable, consistent, and repeatable findings, ACS Grade reagents can be utilized in high-quality research labs. In the United States of America (USA), Lab Alley sells its high- quality Ammonium Molybdate Crystal, Tetrahydrate, ACS Grade online at


Sodium Thiosulfate Crystal Pentahydrate Features:

Assay 99.5-101.0%
pH of a 5% solution @ 25°C 6.0-8.4
Insoluble Matter 0.005%
Nitrogen Compounds (as N) 0.002%
Sulfate and Sulfite (as SO4) 0.1%
Sulfide (as S) To Pass Test (limit about 1 ppm)
Common Uses
  • Reagent
  • Chemical precursor
  • Volumetric analysis
Commercial/industrial applications
  • Photographic processing
  • Hand warmers/heating pads
  • Refining of gold
Safety and Handling

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

Product Ordering Options, Prices, Bulk Sizes & Shipping

You can buy Sodium Thiosulfate Pentahydrate, ACS Grade for $28 online, locally or call 512-668-9918 to order bulk sizes. Your packages will be shipped in 1-2 business days via UPS or LTL. Lab Alley Brand Sodium Thiosulfate Pentahydrate, ACS Grade is for sale in bulk sizes and is in stock. Handy individual consumer size containers for DIY projects are leak resistant. This high quality compound is made in America. It is a high purity chemical substance that is ideally suited for scientific, development, analytical, clinical, medical, research and testing applications. Sodium Thiosulfate Pentahydrate, ACS Grade is delivered quickly to laboratories, factories and businesses in safe chemical resistant containers. 

Manufacturing size drums, IBC totes, pallet loads and bulk industrial production scale quantities are shipped from Lab Alley's U.S.-based distribution centers by LTL freight carriers. Request a discounted wholesale price quote, here. Read customer and product reviews, here. Read return and refund policies, here. Lab Alley, founded in 2013, is a reliable Sodium Thiosulfate Pentahydrate, ACS Grade supplier and distributor headquartered near Austin, Texas. Lab Alley was a 2021 Inc. 5000 honoree. Email if you have questions about buying Sodium Thiosulfate Pentahydrate, ACS Grade. 

Download the Sodium Thiosulfate Pentahydrate, ACS Grade MSDS/SDS to get safety tips and health hazard information. Sodium Thiosulfate Pentahydrate, ACS Grade should be carefully handled, stored in a cool dry place and chemical waste should be disposed of properly and safely.

Sodium Thiosulfate Pentahydrate, ACS Grade Retail Prices, Package Sizes And Bulk Quantity Ordering Options: 500g $28, 1kg $50, 2.5kg $83, 12kg $308, 25kg $572.

Sodium Thiosulfate Pentahydrate, ACS Grade

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