Alien Juice Bar-Online pH Activity

Name: Alfred Lam

Period: Gilman 7

Gems Alien Juice Bar Go to http://sv.berkeley.edu/showcase/flash/juicebar.html Challenge 1 – Alien Juice Bar 1. Click on Challenge 1 then “start”. 2. Click on the pitcher of purple cabbage juice and drag towards one of the three drinks. 3. The cabbage juice will pour into the beaker and may or may not change color. 4. Continue until all three drinks have been poured. 5. Place the drinks on the correct shelf above the Alien’s head according to its pH. 6. When finished, pull the “check me” lever. 7. If you are wrong, the bottles will come off the shelf. Try again until you get them all right! 8. Fill in the data table to show your results. Drink Window Cleaner Lemon Juice Water

Color in Beaker Green Pink Purple

Acid, Neutral or Base? Base Acid Neutral

Click on “Test More” to continue. 9. Click on the pitcher of cabbage juice and drag towards one of the nine drinks. 10. You may pour the cabbage juice to indicate if it is acidic, basic, or a neutral drink. 11. Continue until all nine drinks have been poured, or you can try to guess the pH of each bottle! 12. Place the drinks onto the correct shelf above the Alien’s head. 13. When done, pull the “check me” lever. 14. If you are wrong, the bottles will come off the shelf – try again until you get them all right! 15. Fill in the table to indicate where each drink belongs. Acid Coffee Tea Orange Juice Soda Pop

Neutral Distilled Water

Click on “Continue” for a surprise! Click on “Main Menu” to continue to Challenge 2..

Base Liquid Soap Toothpaste Juice Mouth Wash Cough Medicine

Challenge 2 – The Flying Cabbage Juice Bar: 1. Read the directions on the screen and then hit “Start” 2. Listen to your customers carefully, if you give them wrong drink, they can get sick or even die and you will lose your license! Good Luck! 3. You can test the pH of each drink with the pitcher of cabbage juice and you can also restock the shelf if you run low on drinks. 4. Record your results into the data table. Customer # Example 1 2 3 4 5 6

They Asked For: Neutral Neutral Basic

You Gave:

Sick Customer? Yummy or Try Again Dead? Water Yummy! Yummy! Yummy

Lemon Juice Water Cough Drop Medicine Acid Lemon Juice Yummy Acid Orange Juice Yummy Basic Toothpaste Yummy Juice Neutral Water Yummy Challenge 3: Making Acids and Bases 1. Click “start” to begin Challenge 3 2. Drag the purple cabbage juice over each glass to determine the pH of each drink. The pH will be indicated at the base of the glass. 3. Follow the request of the Alien to change the pH of each drink. Add an acidic drink, neutral drink, or basic drink to change the pH. 4. Fill in the data table: Glass #

Initial pH

1 2 3 4

8 2 7 1

5 6

7 5

What did you add to change the pH? Lemon juice Toothpaste juice Orange juice Cough medicine juice Coffee Liquid soap

Final pH 3 9 5 9 3 8

Congratulations! You are now an expert on the effect of pH! I learned that the pH of things is important and that it can help determine the acidity of a liquid. I also learned that all liquids have a ph and that there are indicators to help determine the ph of a liquid. Cabbage juice is used as an indicator but is not as accurate as ph paper. It only gives you the difference in color while Ph indicators give you a color which corresponds to a number. Not only will I use what I learned in this activity for more games, but in real life to determine the acidity of various types of liquids.