Potassium thiosulfate

Potassium thiosulfate, commonly abbreviated KTS, is an inorganic compound with the formula K2S2O3. This salt can form multiple hydrates, such as the monohydrate, dihydrate, and the pentahydrate, all of which are white or colorless solids. It is used as a fertilizer.

Potassium thiosulfate
Names
Other names
  • Dipotassium monothiosulfate
  • KTS
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.593
EC Number
  • 233-666-8
UNII
  • InChI=1S/2K.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
    Key: FGRVOLIFQGXPCT-UHFFFAOYSA-L
  • [O-]S(=O)(=S)[O-].[K+].[K+]
Properties
K2S2O3
Molar mass 190.32 g/mol
Appearance White solid
Density 2.37 g/cm3
96.1 g/100 ml (0 °C)
155.4 g/100 ml (20 °C)
165 g/100 ml (25 °C)
175.7 g/100 ml (30 °C)
204.7 g/100 ml (40 °C)
215.2 g/100 ml (50 °C)
238.3 g/100 ml (60 °C)
255.2 g/100 ml (70 °C)
293.1 g/100 ml (80 °C)
312 g/100 ml (90 °C)
Hazards
GHS labelling:
Warning
H315, H319
P264, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362
Related compounds
Other anions
 Potassium sulfite; Potassium sulfate
Other cations
 Sodium thiosulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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