Uses Potassium Sulphate

The potassium sulphate or potassium sulphate is a chemical compound with the formula K2SO4which is presented as a white powder or granules.

Potassium sulphate is mainly used as a fertiliser in crops. Potassium (K) is one of the main plant nutrients and potassium sulphate is the main way of supplying it. It is also used as a food additive with the code E515.

Chemical formula of Potassium Sulphate

Here we can see the chemical formula of Potassium Sulphate and other chemical properties of Potassium Sulphate:

Other names Arcanita
Potassium sulphate
Dipotassium salt of sulphuric acid
Di-potassium sulphate
Chemical formula K2SO4
CAS number 7778-80-5
Physical properties
Appearance white solid
Density 2.66 g/cm3
Chemical properties
Solubility in water 111 g/L (20 °C)
120 g/L (25 °C)
240 g/L (100 °C)
Family sulphate

Where to find Potassium Sulphate

Natural sources: Natural sources of potassium sulphate are those salts which contain large amounts of magnesium. The minerals are: Kainite, Schönite, Leonite, Langbeinite, Glaserite, Polyhalite.

Synthesis: It is very common to obtain it through synthesis in industry. It can be synthesised through the reaction of sulphuric acid with potassium hydroxide, the formula being as follows: H2SO4 + 2KOH -> K2SO4 + 2H2O.

 Uses of Potassium Sulphate

  • The main use would be as fertiliser from the agricultural industry, to provide the potassium that plants need to grow their crops: see potassium sulphate fertiliser.
  • In the aquariums the role of individual potassium sulphate is especially important, as the rest of the nutrients needed by the plants will be provided by the aquarium itself (via the fish food): see more on potassium sulphate aquarium.
  • It is also used in the pharmaceutical industry as a raw material for medicines as a potassium supplier.

Potassium is one of the nutrients that plants need for their growth. In total there are 12 different nutrients that plants need. Besides potassium there are nitrogen, phosphorus, sulphur, magnesium, calcium, iron, copper, zinc, boron, manganese, chlorine and molybdenum. There are combination fertilisers that will give the combined supply of the nutrients or specific fertilisers that will give the specific component, such as potassium nitrate to give the nitrogen supply.

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