Potassium bisulfate/ Potassium Sulphate is an

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistr ...

with the chemical formula KHSO₄ and is the potassium

acid salt Acid salts are a class of salts that produce an acidic solution after being dissolved in a solvent. Its formation as a substance has a greater electrical conductivity than that of the pure solvent. An acidic solution formed by acid salt is made duri ...

of sulfuric acid. It is a white, water-soluble solid.

Preparation

More than 1 million tons were produced in 1985 as the initial stage in the Mannheim process for producing potassium sulfate. The relevant conversion is the exothermic reaction of potassium chloride and sulfuric acid: :KCl + H₂SO₄ → HCl + KHSO₄ Potassium bisulfate is a by-product in the production of nitric acid from potassium nitrate and sulfuric acid: : KNO₃ + H₂SO₄ → KHSO₄ + HNO₃

Chemical Properties

Thermal decomposition of potassium bisulfate forms

potassium pyrosulfate Potassium pyrosulfate, or potassium disulfate, is an inorganic compound with the chemical formula K2S2O7. Production Potassium pyrosulfate is obtained by the thermal decomposition of other salts, most directly from potassium bisulfate: : 2 KHSO4 ...

: : 2 KHSO₄ → K₂S₂O₇ + H₂O Above 600 °C potassium pyrosulfate converts to

potassium sulfate Potassium sulfate (US) or potassium sulphate (UK), also called sulphate of potash (SOP), arcanite, or archaically potash of sulfur, is the inorganic compound with formula K2SO4, a white water-soluble solid. It is commonly used in fertilizers, prov ...

and

sulfur trioxide Sulfur trioxide (alternative spelling sulphur trioxide, also known as ''nisso sulfan'') is the chemical compound with the formula SO3. It has been described as "unquestionably the most important economically" sulfur oxide. It is prepared on an ind ...

: :K₂S₂O₇ → K₂SO₄ + SO₃

Uses

Potassium bisulfate is commonly used to prepare

potassium bitartrate Potassium bitartrate, also known as potassium hydrogen tartrate, with formula K C4 H5 O6, is a byproduct of winemaking. In cooking, it is known as cream of tartar. It is processed from the potassium acid salt of tartaric acid (a carboxylic a ...

for

winemaking Winemaking or vinification is the production of wine, starting with the selection of the fruit, its fermentation into alcohol, and the bottling of the finished liquid. The history of wine-making stretches over millennia. The science of wine and w ...

. Potassium bisulfate is also used as a disintegrating agent in analytical chemistry or as a

precursor Precursor or Precursors may refer to: * Precursor (religion), a forerunner, predecessor ** The Precursor, John the Baptist Science and technology * Precursor (bird), a hypothesized genus of fossil birds that was composed of fossilized parts of u ...

to prepare

potassium persulfate Potassium persulfate is the inorganic compound with the formula K2 S2O8. Also known as potassium peroxydisulfate, it is a white solid that is sparingly soluble in cold water, but dissolves better in warm water. This salt is a powerful oxidant, co ...

, a powerful oxidizing agent.

Occurrence

Mercallite, the

mineralogical Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts. Specific studies within mineralogy include the proces ...

form of potassium bisulfate, occurs very rarely. Misenite is another more complex form of potassium bisulfate with the formula K₈H₆(SO₄)₇.

References

Sulfates Potassium compounds Acid salts {{inorganic-compound-stub