When the concentration of a strong acid is not substantially higher than 1.0 10-7 M, the ionization of water must be taken into account

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When the concentration of a strong acid is not substantially higher than 1.0 × 10-7 M, the ionization of water must be taken into account in the calculation of the solution's pH.
(a) Derive an expression for the pH of a strong acid solution, including the contribution to [H+] from H2O.
(b) Calculate the Ph of a 1.0 × 10-7 M HCl solution.

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