Key Concepts: pH & pOH Scale

Core Definitions

• pH Scale: Measures hydrogen ion concentration; ranges from 0 (most acidic) to 14 (most basic); 7 is neutral.
• pOH: Measures hydroxide ion concentration. pH + pOH = 14 at 25°C.
• Acidic Solution: pH < 7 (high [H⁺], low [OH⁻]).
• Basic Solution: pH > 7 (low [H⁺], high [OH⁻]).