Science
Ph scale.
Definition
The pH scale measures how acidic or basic a solution is, ranging from 0 to 14. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic (alkaline). Each whole number change represents a tenfold change in hydrogen ion concentration.
Examples
Real-world.
- 1 Lemon juice with a pH around 2 (strongly acidic)
- 2 Pure water at pH 7 (neutral)
- 3 Bleach with a pH around 13 (strongly basic)
Key Fact
pH = −log[H⁺]; each pH unit = 10× change in [H⁺].