1. 2/24/10

2. Share homework with lab partners.

3. Directions: Fill in the blanks using the word bank provided to explain the pH demonstration you saw today in class. It’s not magic, it’s __________. The liquid in the first glass stayed the same when the __________ juice was added and this meant that it was __________. The liquid in the second glass turned __________ meaning that it was an __________. Finally, the liquid in the third glass turned __________ which meant that the liquid was a __________. __________ colored cabbage juice is an __________. It indicates whether a substance is acidic, basic, or neutral by __________ colors. WORD BANK cabbagevioletpHredindicator basegreenacidneutralchanging

5. Today’s Agenda Warm-Up: pH Demonstration Explanation Check and Review Classwork: –Cabbage Patch Indicator Lab Activity –What is pH? Read article and answer questions in complete sentences. Homework: –What is pH? Read article and answer questions in complete sentences. (Due Friday) Conclusion: –What is the pH of acids and bases?

6. Student Objective Tuesday, May 19, 2015 Students will be able to… Use information gathered from investigations to classify materials as acidic, basic, or neutral using the pH scale.

7. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Number the substances from 1-12 as it has been done on the one to the left. Predict the pH of each substance by determining whether you think each substance is a… Strong Acid (pH 1-3) Weak Acid (pH 4-6) Neutral Substance (pH 7) Weak Base (8-10) Strong Base (11-14)

8. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Carefully fill each well about half-way with the correctly numbered substance.

9. Cabbage Patch Indicator 1.Carefully fill the wells halfway with all of the substances. 2.Return to your seat and place your substances in the center of table. 3.Add 5-6 drops of cabbage juice to each sample. 4.Compare each sample to your cabbage juice color chart and record your results on your lab worksheet. 5.Clean up your lab area (neater than it was to begin) and use any remaining time to complete your lab worksheet. Acid Neutral Base 1 2 3 4 5 6 7 8 9 10 11 12 13 14

10. http://www.harcourtschool.com/activity/acids/ Use the pH scale to determine what substance is in each test tube during this computer simulation. Quick practice measuring pH using a pH Scale…

11. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.

13. pH 10pH 13pH 7pH 9 pH 7 pH 3pH 7 pH 5 pH 7pH 11pH 4 + or – 1 pH factor. Change your answer if it is off by more than 1.

14. The strongest base we tested during this lab activity was _____. A.Cheer B.Distilled Water C.Sugar D.Vinegar ???

15. Baking soda Toothpaste Antacid Cheer Ammonia Limestone Distilled water Alcohol Cornstarch Salt Sugar Shampoo Dish soap Grapefruit J Vitamin C Vinegar Aspirin Lemon J Soda Orange J. Acid Neutral Base

16. In the space below, use arrows to indicate the pH of the substances tested. Color your pH chart to match the Cabbage Juice scale at your lab table. Don’t worry about a perfect match, just be sure to show the change in color as you travel from pH 1 to pH 14. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Rubbing Alcohol Baking SodaCheerCornstarchDish SoapDistilled WaterLemon Juice SaltSodaSugarAmmoniaVinegar

17. Lemon Juice VinegarSodaCorn Starch Sugar Distilled Water Rubbing Alcohol SaltDish Soap Baking Soda AmmoniaCheer

18. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 10 13 7 9 7 3 7 7 5 7 11 4 Base Neutral Base Neutral Acid Neutral Acid Neutral Base Acid

19. 0-6.9 7.1-14 7.0 Lemon Juice, Soda, and Vinegar Baking Soda, Cheer, Dish Soap, and Ammonia Corn Starch, Distilled Water, Rubbing Alcohol, Salt, and Sugar 1 st – Lemon Juice 2 nd – Vinegar 3 rd - Soda 1 st – Cheer 2 nd – Ammonia 3 rd – Baking Soda

20. Read What is pH? Answer the 9 question on back using complete sentences. **Also indicate which section your answer came from. DUE FRIDAY – Answer questions 1-5 tonight and 6-9 tomorrow night…or do all 9 tonight…don’t procrastinate!

21. HOMEWORK “What is pH?” Read Article and answer Questions Always copy daily homework into your agenda.

22. With a pH below 7…lemon juice, soda, and vinegar can all be classified as ____. A.Acidic B.Basic C.Neutral D.Unknown ???