The scale indicates the relative concentrations of hydrogen and hydroxyl ions in a solution.

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This statement describes the concept of pH, which is a measure of the relative concentrations of hydrogen and hydroxyl ions in a solution. The pH scale ranges from 0 to 14, with 7 representing a neutral solution where the concentrations of H+ and OH- ions are equal. Solutions with a pH less than 7 are acidic, while solutions with a pH greater than 7 are basic or alkaline.

The Scale Indicates the Relative Concentrations of Hydrogen and Hydroxyl