What are the molar concentrations of #[H+]# and [#OH-#] in pure water at 25°C?
WE know from classic experiments that water undergoes autoprotolysis, i.e. self-ionization.
We could represent this reaction by
Note that (i) and (ii) ARE EQUIVALENT REPRESENTATIONS, and it really is a matter of preference which equation you decide to use. As far as anyone knows, the actual acidium ion in solution is
We can use
The equilibrium constant for the reaction, under standard conditions, is..........
And to make the arithmetic a bit easier we can use the
And thus in aqueous solution under the given standard conditions,
How do you think