Potassium tetrathionate

Potassium tetrathionate
Potassium tetrathionate
Are common
Systematic ; name	Potassium tetrathionate
Traditional names	Potassium tetrathionate
Chem. formula	K 2 S 4 O 6
Physical properties
condition	colorless crystals
Molar mass	302.45 g / mol
Density	2.28; 2.296 g / cm³
Chemical properties
Solubility in water	23.2 g / 100 ml
Classification
Reg. CAS number
PubChem
Reg. EINECS number
Smiles
Inchi
Chebi
ChemSpider

Potassium tetrathionate is an inorganic compound, a salt of potassium and tetrathionic acid with the formula K ₂ S ₄ O ₆ , colorless crystals, dissolved in water.

Content

Getting

Oxidation of a dilute potassium thiosulfate solution with iodine :

{\mathsf {2K_{2}SO_{3}S+I_{2}\ {\xrightarrow {}}\ K_{2}S_{4}O_{6}+2KI}}

{\ displaystyle {\ mathsf {2K_ {2} SO_ {3} S + I_ {2} \ {\ xrightarrow {}} \ K_ {2} S_ {4} O_ {6} + 2KI}}}

Physical Properties

Potassium tetrathionate forms colorless crystals of monoclinic syngony, space group C c , cell parameters a = 2.2081 nm, b = 0.7991 nm, c = 1.0108 nm, β = 102.28 °, Z = 8.

It is soluble in water, not soluble in ethanol .

Chemical Properties

Decomposes on heating:

{\mathsf {K_{2}S_{4}O_{6}\ {\xrightarrow {T}}\ K_{2}SO_{4}+SO_{2}+2S}}

{\ displaystyle {\ mathsf {K_ {2} S_ {4} O_ {6} \ {\ xrightarrow {T}} \ K_ {2} SO_ {4} + SO_ {2} + 2S}}}

Reacts with sulfides :

{\mathsf {K_{2}S_{4}O_{6}+K_{2}S\ {\xrightarrow {}}\ 2K_{2}S_{2}O_{3}+S}}

{\ displaystyle {\ mathsf {K_ {2} S_ {4} O_ {6} + K_ {2} S \ {\ xrightarrow {}} \ 2K_ {2} S_ {2} O_ {3} + S}}}

Literature

Chemistry Handbook / Editorial: Nikolsky B.P. et al. - 3rd ed., rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Lidin R. A. , Andreeva L. L. , Molochko V. A. Chemical properties of inorganic substances: Textbook. manual for universities - 3rd ed., Rev. - M .: Chemistry , 2000. - 480 p. - ISBN 5-7245-1163-0
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