POTASSIUM TETRATHIONATE Chemical Properties

Density 

2.96 g/mL at 25 °C (lit.)

storage temp. 

2-8°C

solubility 

232g/l

InChI

InChI=1S/2K.H2O6S4/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2

InChIKey

UVTKHPSJNFFIDG-UHFFFAOYSA-L

SMILES

S([O-])(=O)(=O)SSS([O-])(=O)=O.[K+].[K+]

EPA Substance Registry System

Potassium tetrathionate (13932-13-3)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36-37/39

WGK Germany 

3

RTECS 

XF6450000

HS Code 

2842 90 80

Toxicity

LD50 orally in Rabbit: > 2000 mg/kg

MSDS

• Language:English Provider:SigmaAldrich

POTASSIUM TETRATHIONATE Usage And Synthesis

Uses

Used in the preparation of tetrathionate hydrolase assay from Acidithiobacillus caldus, it acts as an energy source.

Definition

ChEBI: A potassium salt composed of potassium and tetrathionate ions in a 2:1 ratio.

Preparation

Potassium tetrathionate is prepared by a similar reaction—the reaction of S2Cl2 with sulphurous acid, followed by KOH neutralization, as shown by the equations.
2H2S03 + S2C12->H2S406+2HCl
H2S406+2KOH -> K2S406 + 2H2O or by the reaction of iodine with K2S2O3.
2K2S203 + I2 -> K2S406+2KI.
The reaction is carried out in an ethanol-water mixture, a medium in which the potassium tetrathionate is insoluble; the K2S406 precipitates as colorless shiny platelets.

General Description

The crystal structure of potassium tetrathionate is monoclinic with a=22.081^o, b=7.991^o, c=10.108^o

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