2/26/10. pH Clicker Challenge 1.What color is red cabbage juice? 2.Red cabbage juice will turn _____...

2/26/10

pH Clicker Challenge1.What color is red cabbage juice?

2.Red cabbage juice will turn _____ in an acid.

3.What color will red cabbage juice turn a substance that is pH 6?

4.What color will red cabbage juice turn a substance that is pH 12?

5.Will cabbage juice change colors when added to pure water?

http://images.google.com/imgres?imgurl=www.miamisci.org/ph/cabbagebig.gif&imgrefurl=http://www.miamisci.org/ph/phcabbage.html&h=143&w=180&prev=/images%3Fq%3Dred%2Bcabbage%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8

Please select a Team.

Tea

m 1

Tea

m 2

Tea

m 3

Tea

m 4

Tea

m 5

0% 0% 0%0%0%

A. Team 1

B. Team 2

C. Team 3

D. Team 4

E. Team 5

???

1. What color is red cabbage juice?

Red

Blu

e

Purp

le

Gre

en

Yel

low

0% 0% 0%0%0%

A. Red

B. Blue

C. Purple

D. Green

E. Yellow

???

2. Red cabbage juice will turn _____ in an acid.

Pin

k or

Red

Vio

let o

r Pur

ple

Blu

e or

Gre

en

0% 0%0%

A. Pink or Red

B. Violet or Purple

C. Blue or Green

???

3. What color will red cabbage juice turn in a substance that is pH 6?

Pin

k or

Red

Vio

let o

r Pur

ple

Blu

e or

Gre

en

0% 0%0%

A. Pink or Red

B. Violet or Purple

C. Blue or Green

???

4. What color will red cabbage juice turn in a substance that is pH 12?

Pin

k or

Red

Vio

let o

r Pur

ple

Blu

e or

Gre

en

0% 0%0%

A. Pink or Red

B. Violet or Purple

C. Blue or Green

???

5. Will cabbage juice change colors when added to pure water?

Yes N

o

0%0%

A. Yes

B. No

???

Today’s Agenda

Warm-Up: pH Clicker Challenge Classwork:

“What is pH?” Homework Check pH Computer Assignment Check BrainPop Acids and Bases pH Properties Sort-it-Out Activity

Homework: None!

Conclusion: What is pH? What does pH stand for?

Student ObjectiveFriday, April 21, 2023

Students will be able to…Define and describe how

the pH of a substance is determined.

Identify some properties of acids and bases.

What is pH and how is it

determined?

What is pH and how is it determined?

In your response be sure to include:•Define pH and explain what pH stands for.•Describe the pH scale and explain what it measures.•Identify the characteristic properties of acids and bases.•Define indicator, provide 2 examples of substances that are indicators, and explain how they work.

pH Computer Assignment Check

http://sv.berkeley.edu/showcase/flash/juicebar.html

What color does cabbage juice turn in acids, bases, and neutrals?

Name 3 acids? 3 bases? 1 neutral?

How do you make an acid become neutral? Base become neutral?




Visit the following websites to explore and learn about pH.


http://www.miamisci.org/ph/phpanel.html

http://pbskids.org/zoom/games/kitchenchemistry/virtual-start.html

The pH Scale

http://www.brainpop.com/science/matterandchemistry/ph/

Which of the following is true about the pH scale?

0% 0%0%0%

A. Substances with a pH below 7 are bases.

B. Substances with pH above 7 are acids.

C. Substances with a pH of exactly 7 are neutral.

D. All of the above.

???

Take out your homework article and answers.

Acid Neutral Base

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1. What causes a substance to be acidic?

2. What causes a substance to be basic?

3. Why is water neutral?

4. If you have acid indigestion why does antacid help you feel better?

5. What is an indicator?

A substance is considered to be an acid when it has many hydrogen atoms.

(Section 2)

(Section 2)

(Section 3)

(Section 2 & 4)

(Section 5)

An acid has many

hydrogen atoms.

H+

H+

H+

H+

H+

H+







A substance is considered to be basic when it contain a combination of hydrogen and oxygen atoms called hydroxyl groups.

(Section 2)

(Section 2)

(Section 3)

(Section 2 & 4)

(Section 5)

A base has many of hydrogen and oxygen

atoms combined in hydroxyl groups.

(Alkaline is another word for base.)

HO

-

HO

-

HO

-








Water is neutral because it has a pH of 7 and has an equal number of hydrogen (H) and hydroxyl (OH) groups.

(Section 2)

(Section 2)

(Section 3)

(Section 2 & 4)

(Section 5)

Water is neutral because every water molecule has one hydrogen (H+) and one hydroxyl (OH-). The positive and negative cancel each other out leaving a chemically neutral substance.

HydrogenHydrogen

Hydrogen-OxygenHydrogen-Oxygen








Water is neutral because it has a pH of 7 and has an equal number of hydrogen (H) and hydroxyl (OH) groups.

(Section 2)

(Section 2)

(Section 3)

Antacids make you feel better because they are a base and they help raise the pH of your stomach acid towards neutral.

(Section 2 & 4)

An indicator is a chemical that changes colors in an acid or base.

(Section 5)

Cabbage Juice Litmus paper

Bromothymol Blue

(BTB)Phenolphthalein

Name: _______________

Date: _______________

Class: _______________An indicator is… ________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

Cabbage Juice

pH = 0-6.9 pH = 7.0 pH = 7.1-14

Red-Pink Purple Blue-Green

Litmus (Paper Strips)

Color Blue Litmus Red Litmus

Acid Turns Red Stays the Same

Base Stays the Same Turns Blue

Red Litmus - - - - - - - - - - - Dipped in Basic Solution

Blue Litmus - - - - - - - - - - - Dipped in Acidic Solution

Bromthymol Blue (BTB)

pH = 0-6.9 pH = 7.0 pH = 7.1-14

Yellow Green Blue

Phenolphthalein (Not H2O Soluble)

pH = 0-8.2 pH = 8.3-14

Clear Pink

Cabbage Juice Litmus paper

Bromothymol Blue

(BTB)Phenolphthalein

6. Give three examples of indicators:

7. Why should you brush your teeth more than once daily?

8. What is another word for basic substances?

9. How many times more acidic is a pH 4 compared to pH 7?

Examples of indicators are litmus paper, Bromothymol blue, grape juice, cabbage juice, and some purple flowers.

(Sections 5 & 6)

You should brush your teeth more than once daily because the base toothpaste neutralizes the mouth and kills the bacteria that causes cavities, but soon the effect wears off and the bacteria return.

(Section 4)

Another word for a basic substance is alkaline.

(Section 3)

A pH 4 is 1000 times more acidic than pH 7 because the pH scale changes by powers of ten.

(Section 5)

pH 7 6 5 4

How much more acidic

Start 10 x 100 x 1000 x

pH 7 8 9 10

How much more basic

Start 10 x 100 x 1000 x

What is pH? Article

What do you know about substances that are acidic, basic (alkaline), or neutral?

ACIDS BASES

NEUTRAL

Acids and Baseshttp://www.brainpop.com/science/matterandchemistry/acidsandbases/

pH 1-6.9, Tastes sour andhas many HydrogenHydrogen atoms.Dissolve other substances.

pH 7.1-14, Tastes bitter and has many Hydrogen-OxygenHydrogen-Oxygen combinations. They feel slippery and make good cleaners.

PROPERTIES

Can be balanced or neutralized with an acid.

Higher pH number means more base.

pH 7.1 to 14

Many hydrogen and oxygen ions combined in hydroxyl groups (OH-)

Equal number of hydrogen ions (H+) & hydroxyl groups (OH-)

pH 7

Distilled (pure) water is neutral

Makes good cleaner

Tastes bitter

Many hydrogen ions (H+)

pH 1 to 6.9

Lower pH number means more acidic.

Can be balanced or neutralized with a base.

Dissolves other substances

Tastes sour

Feels slippery

HOMEWORK

NONE!!!

Always copy daily homework into your agenda.

A mystery substance has many hydrogen atoms, tastes sour, and dissolves other substances.

What is most likely the pH of this mystery liquid?

0% 0%0%

A.pH 4

B.pH 7

C.pH 10

???

A substance with a pH of 12 can be neutralized (pH balanced) by adding a strong base.

Tru

e

Fal

se

0%0%

A.True

B.False

???

The “H” in pH stands for Hydrogen because pH is a measure of the amount of Hydrogen or

Hydrogen-Oxygen combinations in a substance.

Tru

e

Fal

se

0%0%

A.True

B.False

???

Date post:	16-Jan-2016
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2/26/10. pH Clicker Challenge 1.What color is red cabbage juice? 2.Red cabbage juice will turn _____...

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