Potassium thiosulfate
Basic information
- CAS
10294-66-3- Standard SMILES
O=S([O-])([O-])=S.[K+].[K+]- InChIKey
FGRVOLIFQGXPCT-UHFFFAOYSA-L- Molecular formula
- K2O3S2
- Average molar mass
- 190.33 g/mol
- Monoisotopic mass
- 189.8562992
Names & identifiers
- Preferred name
- Potassium thiosulfate
- IUPAC
- dipotassium;dioxido-oxo-sulfanylidene-λ6-sulfane
- English name
- Potassium thiosulfate
- Molecular formula
- H3KO3S2
- Molecular weight
- 154.24
Names & synonyms
Potassium thiosulfate10294-66-3Thiosulfuric acid (H2S2O3), dipotassium saltUK1TD58L5ODIPOTASSIUM THIOSULFATEDTXSID70893108RefChem:175627DTXCID601323053233-666-8POTASSIUMTHIOSULFATEPotassium Hyposulfitepotassium sulfothioate
Show more names
potassium thiosulphatePotassium thiosulfat6. Potassium thiosulfatePotassium thiosulfate,98%PotassiumThiosulfateK2S2O3PotassiuM thiosulfate >=95%Potassium thiosulfate,AR,98%
Thiosulfuric Acid, Dipotassium SaltDipotassium sulfurothioatedipotassium;dioxido-oxo-sulfanylidene-lambda6-sulfaneMFCD00036292POTASSIUM THIOSULFATE ANHYDROUSUNII-UK1TD58L5OEINECS 233-666-8EC 233-666-8
Database identifiers
- CAS
10294-66-3- PubChem CID
- 61501
- DTXSID
DTXSID70893108- UNII
- UK1TD58L5O
- EC Number
- 233-666-8
- Nikkaji
- J47.982I
Properties
Computed structural properties
- Topological polar surface area
- 104 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 0
- Heavy atoms
- 7
- Formal charge
- 0
- Complexity
- 82.6
Experimental & physicochemical properties
Chemical ClassesOther Classes -> Sulfur Compounds
Physical Description
Liquid
Colorless hygroscopic solid; [Merck Index] White crystalline solid; [Sigma-Aldrich MSDS]
Physicochemical properties
- Density
- 1.484 g/mL · 1.484 g/mL at 25 °C
- solubility
- insoluble in ethanol
- form
- colorless hygroscopic crystals
- color
- colorless hygroscopic crystals, crystalline
- Water Solubility
- 100 g · g/100g H2O: 96.1 (0°C), 165.0 (25°C), 312.0 (90°C); solid phase, K2S2O3 · 2H2O (0°C), 3K2S2O3 ·5H2O (25°C), K2S2O3(90°C) [KRU93]; insoluble alcohol [MER06]
- Merck
- 13 · 13,7777
- Stability
- Stable. Incompatible with strong acids, strong oxidizing agents.
- InChI
- InChI=1S/K.H2O3S2.H/c;1-5(2,3)4;/h;(H2,1,2,3,4);
- InChIKey
- CCCGVZRBXSJUOU-UHFFFAOYSA-N
- SMILES
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 23.8% (161 of 677) of reports.
Warning
H315 (76.2%): Causes skin irritation [Warning Skin corrosion/irritation]
P264, P264+P265, P280, P302+P352, P305+P351+P338, P321, P332+P317, P337+P317, and P362+P364 (click each P-code to see the statement)
Aggregated GHS information provided per 677 reports by companies from 2 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard information
Regulatory Information
Chemical: Thiosulfuric acid (H2S2O3), dipotassium salt
Thiosulfuric acid (H2S2O3), potassium salt (1:2) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Thiosulfuric acid (H2S2O3), potassium salt (1:2) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
REACH registered substance: Potassium thiosulphate (EC: 233-666-8)
Thiosulfuric acid (H2S2O3), dipotassium salt: Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.
Hazards SummaryA skin and strong eye irritant; [Sigma-Aldrich MSDS] See Sodium thiosulfate.
Hazard Classes and CategoriesSkin Irrit. 2 (76.2%)
Safety data
- PPE
- dust mask type N95 (US), Eyeshields, Gloves
- wgk
- 3
- tsca
- TSCA listed
Chemistry & industry
Uses & manufacturing
Uses
Used in photographic developing; [REPROTOX] Used to make fertilizers, large scale and fine chemicals, computer-electronic-optical products, and in the health services industry; [ExPub: ECHA REACH Registrations]
Photographic Processing [Category: Other]
U.S. Production2023: 100,000,000 - <250,000,000 lb
Consumer UsesSoil amendments (fertilizers)
Industry UsesSoil amendments (fertilizers)
General Manufacturing Information
Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing
Thiosulfuric acid (H2S2O3), potassium salt (1:2): ACTIVE
Applications
DescriptionPotassium thiosulfate (KTS) is a liquid fertilizer that supplies potassium and sulfur. Potassium thiosulfate is a neutral to basic, chloride-free, clear, liquid solution that can be applied through fertigation alone or in liquid blends with urea solution, urea ammonium nitrate solutions, and 10-34-0. Very dilute potassium thiosulfate can be used as a foliar fertilizer on certain plants, but is known to cause phytotoxicity symptoms under certain conditions and should be used with caution. Potassium thiosulfate is pH sensitive and becomes unstable at pH below 5.5 and above 8.5. The elemental sulfur in thiosulfate will oxidize and generate sulfuric acid that can lower soil and media pH. Greenhouse and nursery managers should use caution when applying potassium thiosulfate to unbuffered soilless media.
UsesPotassium thiosulfate can be used:For the preparation of aqueous biphasic systems (ABS) for the extraction of organic compounds.For the synthesis of polyacrylonitrile nanoparticles by dispersion/emulsion polymerization.As a reagent for the pretreatment of graphite powder to synthesize graphene oxide from it by Hummers′ method.As an initiator to synthesize organosilicon-based adsorbent to remove iron from crude phosphoric acid.
Related reactions
0 records
No reaction records under the current filter.
Compound notes
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