* Acids: pH values below 7 indicate an acidic solution. The lower the pH, the stronger the acid.
* Examples: Lemon juice (pH 2), stomach acid (pH 1-2), vinegar (pH 2-3)
* Bases: pH values above 7 indicate a basic (or alkaline) solution. The higher the pH, the stronger the base.
* Examples: Baking soda (pH 9), ammonia (pH 11), drain cleaner (pH 13)
* Neutral: A pH of exactly 7 indicates a neutral solution. Pure water is a classic example of a neutral solution.
Important Note: The pH scale is logarithmic, meaning each whole number change in pH represents a tenfold change in acidity or basicity.
