1. Measured on a pH scale (0-14)

2. Is a compound that dissolves in water to form a solution with a pH lower than 7 Examples: Vinegar Lemon Juice Acid Rain

3. Is a compound that dissolves in water with a pH higher than 7 Example: Shampoo Household products

4. pH scale is a measure of acidity 0 being very acidic 14 being very basic. Every increase of 1 on the pH scale, is a increase of 10 times  So a solution with a pH of 3 is 10 times more acidic than a solution with a pH of 4  A solution with a pH of 9 is 10 times more basic than a solution with a pH of 8

5. A pH of 7 means a solution is neutral -neither an acid nor a base

6. pH meters  Consists of a probe attached to a meter  Submerge the tip of the probe and the meter indicates the fluids pH

7. Acid-base indicators  Substances that change colour when they are placed in solutions Blue litmus paper Turns red in an acid Red litmus paper Turns blue in a base Universal Indicators Change colour over a wide pH range Need to use a colour chart to compare

8. When an acid and a base mix, they neutralize and form a salt and water. HCl (aq) + NaOH (aq) ----------------  NaCl (aq) + H 2 O (aq) Acid BaseSalt Water