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It is a white crystalline solid. It dissolves in water easily. It does not dissolve in potassium hydroxide or concentrated ethanol. It can react with additional sulfuric acid to make potassium bisulfate.
It is made by reacting potassium hydroxide and sulfuric acid. It can also be made by reacting potassium chloride with sulfuric acid. It can also be made by reacting sulfur dioxide, oxygen, and potassium chloride with some water.
Arcanite is the mineral form of potassium sulfate.