Acids and Bases Lab Packet Your Name:________________ Mr. Benson’s Class Hour______ 1

Acid Rain Acid Rain is rain with large amounts of acidic material caused by pollution. A pH lower than 6.4.

Draw the Demo

Explain what happened ____________________________________________________________________________________________________________ ____________________________________ ____________________________________ ____________________________________

Introduction/Thinking Questions What is an acid? What does it mean to be basic? How do we measure acids? Bases? What products are acids? Bases? How do you determine the strength of acids and bases? 5

I. Define the Problem: ___________________________________________________________________________________________ 6

II. Focus Question: _________________________________________________________________________________________________________________________ 7

III. Prediction: I think that blueberry/cabbage (circle one) juice will be the better indicator. I think this because ___________________________________________________________. 8

Most people think…… __________cabbage __________blueberry. IV. Share: Most people think…… __________cabbage __________blueberry. 9

V. Drawing: 10

VI. Plan of Action A. Materials: pH paper, blueberry juice, cabbage juice, several different solutions to test, chem plate, water and paper towels 11

B. Independent Variable: ____________________________ VI. Plan of Action B. Independent Variable: ____________________________ 12

C. Dependent Variable: ______________________________ VI. Plan of Action C. Dependent Variable: ______________________________ 13

D. Control: ___________________ VI. Plan of Action D. Control: ___________________ 14

VI. Plan of Action E. Procedure: 1 2 3 4 5 6 7 15

VIII. Data Continued Data Organized in List Leave the next page for a reorganization of solutions from strongest acid (1) to strongest base (16). Neutrals are in the middle. 16

VIII. New Vocabulary Acid - Base- Neutral - Indicator- pH - Ion - 17

Make at least 3 claims backed up by evidence from the data. IX. Claims and Evidence Make at least 3 claims backed up by evidence from the data. 18

X. Conclusion and Reflection In this investigation…. Explain the lab and why you did it. 19

X. Conclusion and Reflection B. My hypothesis was correct or incorrect because… 20

X. Conclusion and Reflection C. Biases, Errors, Things that did or could have skewed the results List problems or errors that occurred during the experiment 21

X. Conclusion and Reflection 1. Explain, how good of an indicator cabbage juice is? 22

X. Conclusion and Reflection 2. Explain, how good of an indicator blueberry juice is? 23

X. Conclusion and Reflection 3. Explain how you can use your results to determine the relative strengths of the chemicals tested? 24

X. Conclusion and Reflection 4. Explain why it is difficult to test pH with a liquid indicators? 25

X. Conclusion and Reflection 5. What good does it do to know whether a substance is an acid or a base (in other words, why is this information useful)? 26

X. Conclusion and Reflection 6. What are the characteristics of an Acid? 27

X. Conclusion and Reflection 7. What are the characteristics of a Base? 28

X. Conclusion and Reflection 8. What color(s) does blueberry juice turn in the presence with an acid? Base? 29

X. Conclusion and Reflection 9. What color(s) does cabbage juice turn in the presence with an acid? Base? 30

X. Conclusion and Reflection 10. How can you add things to change a solution from an acid to make it a base or vise versa? 31

XI.Questions for further thinking Make at least 3 “I wonder…” or “I am still thinking about…” statements. 32