I have not understand how the ratio of dissociated h20 to the undissociated h20 is that what is the logic behind it and sir what does it mean that equilibrium lie mainly toward undissociated water

Dear student,


Water is dissociated as :
$H_{2}O \leftrightarrow H^{+} + O{H}^{-}$
So, if we calculate the equilibrium of this reaction we write as the ratio of dissociated and undissociated water molecule.


Now, K(equilibrium) is greater than the K(w) hence it means the water is available in the dissociated form.
So, to maintain the equilibrium of reaction, the equilibrium will shift towards undissociated form. Hence, we say that equilibrium lies mainly towards the undissociated water.

Regards