Ionic product of Water

Ionic product of Water

Water is a weak electrolyte and undergoes selfionistion to a small extent.

The product of concentrations of and ions in water at a particular temperature is known as ionic product of water.” It is designated as .





The value of increases with the increase of temperature, i.e., the concentration H+ and OH ions increases with increase in temperature.


The value of at is mole/litre. Since pure water is neutral in nature, ion concentration must be equal to ion concentration.


or or or


This shows that at , in 1 litre only mole of water is in ionic form out of a total of approximately 55.5 moles.


Thus when, ; the solution is neutral

; the solution is acidic

; the solution is basic

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