1. Acids and Bases & The pH Scale

2. Brain Pop: pH Scale

3. Acids and Bases When we think of acids and bases we tend to think of science labs and chemicals….but did you know……
Acids cause:
Lemons to be sour
Acid rain to eat away at sculptures
Framed painting to be damaged
Cavities in your teeth
Food to digest in your stomach
Ants and bees use it to sting!

4. Acids and Bases

5. Properties of Acids and Bases
Tastes sour
Acids corrode metals
Positively charged hydrogen ions (H+)
Taste bitter
Feel slippery
Most hand soaps and drain cleaners are bases
Negatively charged hydroxide ions (OH-)

6. pH Scale Neutral 7 Acid Base 1414
pH Scale
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 515

7. Understanding the pH Scale
pH stands for: Presence of Hydrogen
Numbered from 0 to 14
The lower the pH number the higher the Acid
that means more hydrogen ions (H+)
The higher the pH number the higher the Base
that means less hydrogen ions (H+)

8. Common Acids Hydrochloric Acid Citric Acid Lactic Acid
Stomach acid: has the sour taste of acid
Citric Acid
Citrus fruits such as lemons, grapefruit, oranges and limes
Lactic Acid
Sour milk, sour cream, yogurt and cottage cheese.

9. Common Bases
Ammonia
-Used in household cleaning materials and fertilizer. **Most Common!**
Calcium hydroxide
-Used to make mortar and plaster
Sodium hydroxide
Used in oven and drain cleaners **One of the strongest bases**

10. Virtual Lab What is the pH of common solutions?