1. Bell Work!
In exactly SEVEN words, write a complete sentence that summarizes what you learned on Monday and Tuesday. Write this GREAT sentence at the top of page 82 in your composition notebook.

2. SPI 0807.9.12 Identify properties of acids and bases. I can…
List 3 properties of acids.
List 3 properties of bases.
Give examples of household items that are acids and bases.
Can interpret a pH scale.
Identify the ions of an acid and a base.
Differentiate between strong and weak acids and bases.

3. Cabbage Patch Indicator
Chapter 14: Skills Practice Lab

4. Show what you know…
Madison reads the following description of the results of an investigation: “clear liquid, boiling point of 78 degrees Celsius, flammable, soluble in water.” Which of the properties listed is a chemical property?
Clear liquid
Boiling point of 78 degrees Celsius
Flammable
Soluble in water

5. Show what you know…
A compound dissolved in water turns red litmus paper blue and changes the indicator bromthymol blue to dark blue. What kind of compound is it?
Acid
Water
Table salt
Base

6. Show what you know…
What type of compound increases the number of hydronium ions when dissolved in water?
Acid
Base
Indicator
Hydrogen gas

7. Cabbage Patch Indicator:
Indicators are weak acids or bases that change color due to the pH of the substance to which they are added. Red cabbage contains a natural indicator. It turns a specific color at a specific pH. In this lab, you will use it to determine the pH of several liquids.

8. Copy the table below… Cabbage Juice: Data Collection Table Liquid:
Color with Indicator pH A B C

9. Procedure:
Step 1: Using the dropper, place 5 mL of Liquid A into the first test tube.
Step 2: Using a clean dropper, place 5 mL of Liquid B into the second test tube.
Step 3: Using a clean dropper, place 5 mL of Liquid C into the last test tube.
Step 4: Using a clean dropper, place several drops of the indicator into each test tube. Swirl gently. Record the color of each liquid in the table.
Step 5: Use the pH scale to find the pH of each sample. Record it in the table.

10. Clean up… Carefully rinse out all the test tubes.
Rinse out the droppers.
Leave the indicator on the lab table.
Push in your stool.
Quietly sit down and wait to analyze the results.

11. Analyze the Results:
What colors in your samples indicate the presence of an acid?
What colors indicate a base?
Why is red cabbage juice considered a good indicator?
Which do you think would be more useful to help identify an unknown liquid—litmus paper or red cabbage juice? Why?????????
Explain when you’d want to use litmus paper then write about when you’d want to use cabbage juice.