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While studying equilibrium we get to know that there are $1*10^{-7} \ce{~~OH-}$ and $\ce{H+}$ ions in pure water. However, I think there are more undissociated molecules.

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[…] there are $1\cdot10^{-7}\ \ce{OH-}$ […] ions

Are you sure that this is an absolute number or rather a concentration in $\mathrm{\frac{mol}{L}}$? IN the latter case, what would be the concentration of undiscociated $\ce{H2O}$ molecules in 1 liter of water?

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