Equilibrium

Acid - Base

 

 

Pure water, although very poor, is a conductor of electricity. It achieves this by self-ionising according to the reaction below.

 

The equilibrium expression for the reaction above is given below
The concentration of water in aqueous solutions can be considered as a constant. The water molecules are so abundant that relative small changes are insignificant. At a temperature of 25 oC the equilibrium expression is therefore modified to
Ionisation constant of water. The value of the constant at 25 degrees Celsius
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