(B) The $pH$ of a solution is defined as the negative logarithm of the molar concentration of hydrogen ions $[H^+]$ or hydronium ions $[H_3O^+]$ prese

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negative logarithm to the base $10$

(B) The $pH$ of a solution is defined as the negative logarithm of the molar concentration of hydrogen ions $[H^+]$ or hydronium ions $[H_3O^+]$ present in the solution.Mathematically,it is expressed as: $pH = -\log_{10}[H_3O^+]$.Therefore,the correct definition refers to the negative logarithm to the base $10$.