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The pH scale measures H+ in a solution

The pH scale measures the concentration of hydrogen ions (H⁺) in a solution, indicating its acidity or alkalinity. Ranging from 0 to 14, a pH of 7 is neutral, values below 7 are acidic, and values above 7 are basic (alkaline). Lower pH values correspond to higher H⁺ concentration, while higher pH values correspond to lower H⁺ concentration.