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pH is defined as the negative log10 of the hydrogen ion activity, aH+, although general chemistry texts commonly express it in terms of the hydronium ion concentration. Thus, pH = −log10 [H3O+], where [H3O+] represents the concentration of H3O+ in units of moles per liter (M). Calculate the pH or [H3O+], as required, for the following solutions.

{H3O+}= 5.79 X 10^-4M