Potassium disulfate

Potassium disulfate
Potassium disulfate
Are common
Systematic ; name	Potassium disulfate
Traditional names	Potassium pyrosulphate; potassium sulphate
Chem. formula	K 2 S 2 O 7
Physical properties
condition	colorless crystals
Molar mass	254.32 g / mol
Density	2.27 g / cm³
Thermal properties
T. melt.	≈300 ° C
Classification
Reg. CAS number	7790-62-7
Pubchem
Reg. EINECS number
SMILES
Inchi
Chemspider

Potassium disulfate is an inorganic compound, an alkali metal salt of potassium and disulfuric acid with the formula K ₂ S ₂ O ₇ , colorless crystals, it reacts with water.

Content

Getting

Effect of Sulfur Oxide on Potassium Sulfate :

{\mathsf {K_{2}SO_{4}+SO_{3}\ {\xrightarrow {}}\ K_{2}S_{2}O_{7}}}

{\ displaystyle {\ mathsf {K_ {2} SO_ {4} + SO_ {3} \ {\ xrightarrow {}} \ K_ {2} S_ {2} O_ {7}}}}

The decomposition of potassium hydrosulfate :

{\mathsf {2KHSO_{4}\ {\xrightarrow {320-340^{o}C}}\ K_{2}S_{2}O_{7}+H_{2}O}}

{\ displaystyle {\ mathsf {2KHSO_ {4} \ {\ xrightarrow {320-340 ^ {o} C}} \ K_ {2} S_ {2} O_ {7} + H_ {2} O}}}

The decomposition of potassium persulfate :

{\mathsf {2K_{2}S_{2}O_{6}(O_{2})\ {\xrightarrow {65-100^{o}C}}\ 2K_{2}S_{2}O_{7}+O_{2}}}

{\ displaystyle {\ mathsf {2K_ {2} S_ {2} O_ {6} (O_ {2}) \ {\ xrightarrow {65-100 ^ {o} C}} \ 2K_ {2} S_ {2} O_ {7} + O_ {2}}}}

Physical Properties

Potassium disulfate forms colorless crystals.

Chemical Properties

Decomposes when heated above the melting point:

{\mathsf {K_{2}S_{2}O_{7}\ {\xrightarrow {440^{o}C}}\ K_{2}SO_{4}+SO_{3}}}

{\ displaystyle {\ mathsf {K_ {2} S_ {2} O_ {7} \ {\ xrightarrow {440 ^ {o} C}} \ K_ {2} SO_ {4} + SO_ {3}}}

Decomposed by water:

{\mathsf {K_{2}S_{2}O_{7}+H_{2}O\ {\xrightarrow {\ }}2KHSO_{4}}}

{\ displaystyle {\ mathsf {K_ {2} S_ {2} O_ {7} + H_ {2} O \ {\ xrightarrow {\}} 2KHSO_ {4}}}}

Reacts with alkalis:

{\mathsf {K_{2}S_{2}O_{7}+2KOH\ {\xrightarrow {}}\ 2K_{2}SO_{4}+H_{2}O}}

{\ displaystyle {\ mathsf {K_ {2} S_ {2} O_ {7} + 2KOH \ {\ xrightarrow {}} \ 2K_ {2} SO_ {4} + H_ {2} O}}}

Reacts with sulfur oxide :

{\mathsf {K_{2}S_{2}O_{7}+SO_{3}\ {\xrightarrow {}}\ K_{2}S_{3}O_{10}}}

{\ displaystyle {\ mathsf {K_ {2} S_ {2} O_ {7} + SO_ {3} \ {\ xrightarrow {}} \ K_ {2} S_ {3} O_ {10}}}}

Application

In analytical chemistry.
Catalyst.

Literature

Chemist Handbook / Redkol .: Nikolsky B.P. et al. - 3rd ed., Rev. - L .: Chemistry, 1971. - T. 2. - 1168 p.
Lidin R.A. and other Chemical properties of inorganic substances: Proc. manual for universities. - 3rd ed., Corr. - M .: Chemistry, 2000. - 480 p. - ISBN 5-7245-1163-0 .
Lidin R.A. and others. The range of inorganic substances. - M .: Colossus, 2006. - 95 p. - ISBN 5-9532-0446-9 .

Potassium disulfate

Are common
Systematic name	Potassium disulfate
Traditional names	Potassium pyrosulphate; potassium sulphate
Chem. formula	K ₂ S ₂ O ₇
Physical properties
condition	colorless crystals
Molar mass	254.32 g / mol
Density	2.27 g / cm³
Thermal properties
T. melt.	≈300 ° C
Classification
Reg. CAS number	7790-62-7
Pubchem
Reg. EINECS number
SMILES
Inchi
Chemspider