Monopotassium phosphite

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Monopotassium phosphite
Monopotassium phosphite.png Ball-and-stick model of the component ions
CAS number 13977-65-6 YesY
PubChem 23701737
Jmol-3D images Image 1
Molecular formula H2KO3P
Molar mass 120.09 g mol−1
Appearance white crystals
Density 2.14 g/cm3
Solubility in water 220 g/100 mL
Solubility soluble in ethanol
Crystal structure monoclinic
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Monopotassium phosphite is used primarily as a water-soluble fertilizer.


It can be formed by the reaction of a potassium ion (e.g. from potassium hydroxide) with an equimolar amount of phosphorous acid.

See also[edit]