Molekula
Potassium thiosulfate hydrate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium thiosulfate hydrate is a water-soluble inorganic compound used in photography, analytical chemistry, and as a reagent in redox reactions. It is available in various hydration states, with a molecular weight of 208.35 g/mol. CAS number 13446-67-8. Store at ambient temperatures. Signal word: Warning. Molekula supplies Potassium thiosulfate hydrate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White to off-white crystals |
| Water | ≤8.5 |
| pH | 6.5 - 8.0 |
| Iron (Fe) | ≤40 |
| Sulphates (SO4)(2-) | ≤3.0 |
| K2O(g/100g) | ≥48.0 |
| K2S2O3H2O(g/100g) | ≥96.0 |
| Sulphur (S) | ≥30.5 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Identification
| Property | Value |
|---|---|
| SKU | 90018647 |
| CAS Number | 13446-67-8 |
| IUPAC Name | dipotassium;dioxido-oxo-sulfanylidene-lambda6-sulfane;hydrate |
| Molecular Formula | K2S2O3 · xH2O |
| Molecular Weight | 208.35 |
| Exact Mass | 207.8669 |
| SMILES | O.[O-]S(=O)(=S)[O-].[K+].[K+] |
| InChIKey | RCEMYQVDTALKQN-UHFFFAOYSA-L |
| InChI | InChI=1S/2K.H2O3S2.H2O/c;;1-5(2,3)4;/h;;(H2,1,2,3,4);1H2/q2*+1;;/p-2 |
| PubChem CID | 6096947 |
| REACH Code | Y113 |
| HTS Code | 28323050 |
| Tariff Code | 2832300000 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Dipotassium;dioxido-oxo-sulfanylidene-lambda6-sulfane;hydrate
- Potassium sulfurothioate--water (2/1/1)
- RCEMYQVDTALKQN-UHFFFAOYSA-L
Frequently asked questions
What is potassium thiosulfate hydrate commonly used for?
Potassium thiosulfate hydrate is widely used in photography as a fixing agent, in water treatment for chlorine removal, and in chemical synthesis as a reducing agent.
What is the chemical formula and molecular weight of potassium thiosulfate hydrate?
The formula is K₂S₂O₃·xH₂O, where x varies. The molecular weight of 208.35 g/mol corresponds to the monohydrate (x = 1, K₂S₂O₃·H₂O). Anhydrous K₂S₂O₃ is about 190.32 g/mol.
How should potassium thiosulfate hydrate be stored?
Store at ambient temperature in a cool, dry place, away from moisture and incompatible substances like strong oxidizers.
What grades of potassium thiosulfate hydrate does Molekula supply?
Molekula supplies technical grade and ACS reagent grade potassium thiosulfate hydrate, depending on purity and application requirements.
Can Molekula supply potassium thiosulfate hydrate in bulk quantities?
Yes, we offer bulk packaging options (e.g., 25kg bags, 50kg drums) for industrial and large-scale applications—please contact us for specific quantities.
What documentation comes with an order of potassium thiosulfate hydrate?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS/SDS), and a packing list for traceability and compliance.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.