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The ionic product for water is defined by
KW = [H3O+][OH-]
For water at standard temperature and pressure, it is 1.00 x 10-14 mol2/dm6
pKW (which is equivalent to the pH) will be 7 at room temperature,
because it is the -log10 of KW, and -log10 of the square root of 1x10-14 is 7.
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