1. All About Acids and Bases
What we need to know… Acids turn litmus paper _______.
red
blue
Bases turn litmus paper _______.
WHAT IS LITMUS PAPER?

2. INDICATORS
Indicator—substance that changes color in the presence of an acid or base
Types of Indicators:
1. Litmus paper
2. Bromthymol blue
3. Cabbage juice

3. Let’s talk about acids…
Using the Bromthymol blue indicator:
After an acid is added
BEFORE

4. Let’s talk about bases…
Using the Bromthymol blue indicator:
After an acid is added
BEFORE

5. In the lab… Test your unknown substance. Record your results.
Pick up your own trash…do not leave your used litmus paper on any lab table.
At your station, use the blue and red litmus paper.
If your blue litmus paper turns red, it’s an acid.
If your red litmus paper turns blue, it’s a base.
Test your unknown substance.
Record your results.
Decide if the substance is an acid or a base.
Make a prediction.
Find its true identity.

6. I can… List 3 properties of an acid and a base.
Give examples of household items that are acids and bases.
Identify 3 types of indicators.
Use litmus paper to determine if an unknown object is an acid or a base.

7. Let’s race!
Savannah puts ketchup on her hamburgers. The ketchup has a pH of 4. What is the ketchup?
ACID

8. Let’s race!
Baking soda is an example of…
BASE

9. Let’s race!
Charlie found a bottle with a warning label that read: CAUTION—Contents inside will react with metal. What is inside the bottle?
ACID

10. Let’s race!
OH- is a compound that _____ produce when dissolved in water.
BASES

11. Let’s race!
Tums would be an example of…
BASE