1. Chapter 9 Lesson 3 ACIDS, BASES, AND SALTS

2. Vocabulary Acid: substance that tastes sour and turns blue litmus paper red when dissolved in water; releases hydrogen ions Base: substance that feels slippery, tastes bitter, and turns red litmus paper blue when dissolved in water; receives hydrogen ions

3. Vocabulary Indicator: substance that shows whether an acid or base is present pH: system for measuring the strength of acids and bases Salt: what forms when a strong base reacts with a strong acid, typically made of a nonmetal and a metal

4. Acids  Tastes sour  Turns blue litmus paper red  Releases hydrogen ions  Reacts easily with other bases

5. Bases  Tastes bitter  Turns red litmus paper blue  Receives hydrogen ions  Reacts easily with other acids

6. Acid or Base?  Indicators are used to determine if a substance is an acid or base  A common indicator is litmus paper

7. pH Scale  There are different strengths of acids and bases  To measure the strength, scientists use the pH (potential of hydrogen) scale

8. Salts  When a strong acid reacts with a strong base, a salt forms

9. Quiz Chapter 9 Lesson 2 Name two characteristics of acids (2 points) Name two characteristics of bases (2 points) What is a safe way to test for an acid or base? (1 points)