Drive an expression for the 'operational definition of pH.

The operational definition of pH is based on the measurement of hydrogen ion concentration in an aqueous solution. The concept of pH originated from the relationship between the concentration of hydrogen ions and the acidity or basicity of a solution.

In an aqueous solution, water dissociates according to the following equilibrium:

\[ H_2O \rightleftharpoons H^+ + OH^- \]

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