Answer the following questions on paper:

• What was the pH of the water? Using your data, describe how the pH of the water changed as you added the lemon juice? If you know that tap water is neutral (not an acid or a base) and lemon juice is an acid, what type of pH values indicate an acid?

• How did the pH of the water change as you added baking soda? How does the pH of water compare to the pH of the baking soda solution? If you know that tap water is neutral (not an acid or a base) and a baking soda solution is a base, what type of pH values indicate a base?

• How does the pH value of an acid compare to that of a base? The pH scale ranges from 1-14.

• Make a line that starts with the number1 and finishes with the number 14 in a draw program. Make sure that the number 7 is at the center. Refer to Technical Hints to see how to use a draw program to create a pH scale. Based on what you have learned from your investigations, label which values represent acids and which represent bases on your pH scale. Mark the numbers that represent stronger acids and stronger bases.

• Were your leaf solutions acids or bases? Place the names of your leaf selections at the appropriate location on your pH scale.