Sodium Thiosulfate 5-Hydrate

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Disposal

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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