2/24/10

Share homework with

lab partners.

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

cabbage violet pH red indicator base green acid

neutral changing

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?

Student ObjectiveTuesday, April 18, 2023

Students will be able to…

• Use information gathered from investigations to classify materials as acidic, basic, or neutral using the pH scale.

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)

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

Carefully fill each well about half-way with the correctly numbered substance.

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 Base1 2 3 4 5 6 7 8 9 10 11 12 13 14

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…

pH 10 pH 13 pH 7 pH 9

pH 7 pH 3 pH 7 pH 7

pH 5 pH 7 pH 11 pH 4

+ or –

1 pH factor.

Change your

answer if it is off by more

than 1.

The strongest base we tested during this lab activity was _____.

Chee

r

Dis

tille

d Wat

er

Sugar

Vin

egar

0% 0%0%0%

A. Cheer

B. Distilled Water

C. Sugar

D. Vinegar

???

Baking soda

Toothpaste

Antacid

Cheer

Ammonia

Limestone

Distilled water

Alcohol

Cornstarch

Salt

Sugar

Shampoo

Dish soap

Grapefruit J

Vitamin C

Vinegar Aspirin

Lemon JSodaOrange J.

Acid Neutral Base

Lemon Juice

Vinegar Soda Corn Starch

Sugar Distilled Water

Rubbing Alcohol

Salt Dish Soap

Baking Soda

Ammonia Cheer

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

Base

Neutral

Base

Neutral

Acid

Neutral

Neutral

Acid

Neutral

Base

Acid

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

1st – Lemon Juice 2nd – Vinegar 3rd - Soda

1st – Cheer 2nd – Ammonia 3rd – Baking Soda

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!

HOMEWORK“What is pH?”Read Article and answer Questions

Always copy daily homework into your agenda.

With a pH below 7…lemon juice, soda, and vinegar can all be classified

as ____.

0% 0%0%0%

A. AcidicB. BasicC.NeutralD.Unknown

???