Potassium pyrosulfate
- Potassium pyrosulphate
- Dikaliumdisulfat
White, odorless solid
Fixed
2.25 g · cm -3
419 ° C
Soluble in water
Risk
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Potassium disulfate or potassium pyrosulphate K2S2O7 is the potassium salt of disulfuric acid.
Properties and display
Dikaliumdisulfat is a hygroscopic, moisture-sensitive, white and odorless solid that is soluble in water, its aqueous solution is strongly acidic.
It is formed by heating potassium bisulfate:
On further heating, the Potassium disulfate decomposes at about 600 ° C in potassium sulfate and sulfur trioxide:
Upon contact with water, Potassium disulfate decomposed into sulfuric acid and potassium sulphate:
Use
Potassium disulfate is used for example for an acid digestion of salts in the heat:
The iron thus formed ( III) sulphate is water-soluble.