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Sodium Thiosulfate 5-Hydrate

SS0880-2.5KG SS0880-500GR SS0897-CONC SS0880-500G
CAS Number: 10102-17-7
Formula: Na2S2O3 5H2O
Density: 1.685 g/mL
Boiling and Freezing Point: 100°C, 48°C
Solubility: Water
Synonyms: Sodium Thiosulfate Pentahydrate
Shelf Life: 12 Months

Note: The chemical specifications for some items on this product page may differ from the specifications listed above. For more information, consult the Safety Data Sheet or contact your Ward's representative.

Caution: Caution:This product is designed for educational and teaching laboratories, and no certificate of analysis is available.



Item # Description Grade Size Chemical/Physical Specifications Unit Availability Price Quantity
470302-722 Sodium Thiosulfate 5-Hydrate
Reagent 500 g Crystal Each (500g) Retrieving Restricted
470302-720 Sodium Thiosulfate 5-Hydrate
Laboratory 500 g Crystal Each (500g) Retrieving Restricted
470302-718 Sodium Thiosulfate 5-Hydrate
Laboratory 2.5 kg Crystal Each (2,500g) Retrieving Restricted
470302-730 Sodium Thiosulfate 5-Hydrate, QuickPrep
Laboratory Makes 500 mL 0.1 M Each (50ml) Retrieving Restricted
restricted This product is marked as restricted and can only be purchased by approved Shipping Accounts. To apply for a shipping account number, click here. If you need further assistance, call Customer Service at 800-962-2660 or email


This disposal method is published for your convenience. You MUST have checked with your federal, state, and local regulations before using this method and these methods are only applicable for small laboratory sized quantities.

Use a lab apron, chemical resistant gloves and goggles before following the below method to dispose of hazardous waste.

 1. Add the substance to be disposed of to a large beaker and dissolve it in water. Place the beaker in a fume hood.
 2. Add an equal amount of sodium carbonate to the mixture.
 3. Slowly add a 25% molar excess of bleach to the mixture. Stir.
  a. Add the bleach very slowly as a reaction will occur and produce heat. Keep the reaction under control.
 4. Wait four hours.
 5. Neutralize the resulting mixture with either dilute hydrochloric acid or dilute sodium hydroxide to a pH of about 7.
 6. Pour the final solution down the drain with at least a 20-fold excess of water.

Solution Prep

To prepare a solution, determine the formula weight of the material, the concentration (Molarity) of the solution, and the amount of solution desired in Liters. Once this information has been obtained, use the following formula:
(Formula Weight) x (Concentration) x (Desired Volume) = Number of grams in desired volume of liquid

For a 1 M, 1 L solution:
(Formula Weight) x (1 mol/L) x (1 L) = x g added to 1-L volumetric flask. Dilute to a final volume of 1 L with DI Water.


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