Potassium Chloride

Formula: KCl

Potassium Chloride

Potassium chloride is a potassium analog of a table salt. It has the same cubic crystalline structure and shape of crystals. Large crystals are easy to grow, but often get cloudy and badly formed.


  • Crystal system: isometric
  • Crystal shape: cuboid
  • Color: colorless
  • Stability on air: very stable


Potassium chloride is used as a fertilizer and can be obtained in gardenig stores, but precence of chloride ion makes it less popular choice than other potassium fertilizers.


Potassium chloride grows much more easily than NaCl. I used slov evapotation to produce the samples on photos.

Its solubility changes a lot with temperature: 34g/100ml at 20°C; and 51.3g/100ml at 80°C. However, in my experiments cooling of saturated solution only produced large number os thin needle-like crystals.


This compound is safe.

More photos

Potassium Chloride

See also

  • Sodium chloride, NaCl. It has same crystal structure and shape, but is much harder to grow.
  • Glucuse sodium chloride, 2C6H12O6·NaCl·H2O. It is a cocrystal of table salt and glucose sugar. It has completely different crystal shape and structure, and also an easy compound to grow.