1. Notes Science SPI 0807.9.12 Acids and Bases
Learning Intention: Identify the basic properties of acids.
Purpose: to understand that many common substances contain acid (including items that we eat and drink)
Success Criteria
I will show that I understand this topic by earning a 90 or
higher on the quiz.
I Can Statement
By the end of this unit I will be able to say...
...I can describe three or more properties of acids

2. Acids neutralize bases and bases neutralize acids
Acid Properties
An acid is any compound that increases the number of positive hydronium ions when dissolved in water.
Note: An hydronium ion is an hydrogen atom that has lost an electron and has therefore become positively charged.
Acids have a sour flavor The sour taste of lemons, limes, and other citrus fruits is a result of citric acid.
Acids neutralize bases and bases neutralize acids
Acids conduct electricity and are used in batteries

3. Yummy! Notes Acids SPI 0807.9.12 Memory Trick Acids and Bases
Acids and Hydronium
SPI
Acids and Bases
Notes
Acids
Acids are found in popular foods such as oranges, soft drinks, and tomatoes (think pizza, lasagna and spaghetti).
So think of acids as hydroniYUM because acids go with hydronium ions.
Yummy!

4. This flask contains bromothymol blue. color changes to yellow.
Acids Change Colors in Indicators
Examples of Indicators:
litmus paper
cabbage juice
phenolphthalein
bromothymol blue
This flask contains bromothymol blue.
When acid is added, the
color changes to yellow.

5. Litmus paper- is a common acid/base indicator
blue litmus paper turns red in acids

6. Acids Review Questions SPI 0807.9.12 Acids and Bases
Fill in the blanks using the following words
red, hydronium, acids, compound, sour
1) An acid is any ____________that increases the number of _____________ions.
2) Acids have a _______ flavor.
3) _________ neutralize bases.
4) Blue litmus paper turns ______ in acids.
compound
hydronium
sour
Acids
red
Acids

7. Notes Acids SPI 0807.9.12 Acids and Bases Acids react with some metals
Acid Properties
(continued)
Notes
Acids
Acids react with some metals
Acids react with some metals to produce hydrogen gas.
Example: hydrochloric acid with zinc metal
Acids conduct electric current
Example: found in automobile (car and truck) batteries

8. Acids Review Questions SPI 0807.9.12 Acids and Bases metals ions
Fill in the blanks using the following words
ions, electricity, metals
1) Acids react with some ________.
2) _____ are formed during chemical reactions when electrons are lost or gained
3) Acids conduct ___________.
metals
ions
electricity
BONUS QUESTION
How is an ion different from an atom?
Ions are positive or negative, but atoms have no charge.
Otherwise, atoms and ions look nearly identical

9. The pH scale (pH=power or potential of hydrogen)
pH scale: measures acidity or basicity (A.K.A. Alkalinity).
(tells you how strong or weak acids and bases are)
Acids are 0 to on the pH scale
7 is neutral (pure water is 7)
Acids are 0 to 6.9

10. More About the pH scale Again…acids are 0 to 6.9 on the pH scale
The lower the number…the stronger the acid
In other words, an acid with a pH of 1 is stronger than an acid with a pH of 5
pH 1 is stronger than pH 5

11. The pH Scale can be displayed four different ways
Ex: Vertical -0 at top and 14 at bottom
Ex: Vertical -14 at top and 0 at bottom
Ex: Horizontal -0 on the left with 14 on the right
Ex: Horizontal -14 on the left with 0 on the right
pH Scale
Yet the pH ranges stay the same.
pH Scale
(0 to 6.9 for acids and 7.1 to 14 for bases)
pH Scale
pH Scale

12. Acids Review Questions SPI 0807.9.12 Acids and Bases
Fill in the blanks using the following words
0 to 6.9, True, seven, vinegar, pH scale
1) A __________ shows you how strong or weak an acid or base is (called acidity or basicity/alkalinity).
2) On a pH scale, the range for acids is ________.
3) Neutral substances have a pH of ________.
4) (True or False): An acid with a pH of 2 is stronger than an acid with a pH of 4. ___________.
5) Which substance has greater acidity, pure water or vinegar? __________.
pH scale
0 to 6.9
seven
True
vinegar

13. F.Y.I.---How are acids used?
SPI
Acids and Bases
Notes
Acids
F.Y.I.---How are acids used?
Sulfuric acid is (most common) used to make paper, paint, detergents, fertilizers and many other products like batteries
Nitric acid is used to make fertilizers, rubber, and plastics.
Hydrochloric acid is used to separate metal from their ores. It is also used in swimming pools and in your stomach.
Citric acid and ascorbic acid (Vitamin C) are found in orange juice, grapefruit juice, and tomatoes.
Carbonic acid and phosphoric acid are in soft drinks.

14. Science Video SPI 0807.9.12 Links Acids and Bases
Link 01 (1 min 59 sec): Universal Indicator
Watch a universal indicator change colors
Link 02 (2 min 08 sec): Using Litmus Paper
Watch two girls use litmus paper with an acid and then a base
Link 03 (2 min 49 sec): Coke can in acid
Watch acid dissolve a Coke can
Link 04 (1 min 57 sec): Cheeseburger in Acid
Watch acid dissolve a McDonalds cheeseburger

15. Acids Questions SPI 0807.9.12 Acids and Bases
Litmus paper- is a common acid/base indicator
Questions
SPI
Acids and Bases
Acids
blue litmus paper turns red in acids

16. Acids are 0 to 6.9 on the pH scale
Questions
SPI
Acids and Bases
Acids
Acids are 0 to on the pH scale
Acid
Acid

17. Acids are 0 to 6.9 on the pH scale
Questions
SPI
Acids and Bases
Acids
Acids are 0 to on the pH scale
Acids have a sour flavor The sour taste of lemons, limes, and other citrus fruits is a result of citric acid.

18. Acids Questions SPI 0807.9.12 Acids and Bases
A) Clams and Snails can only tolerate pH 4.5 to 5.0
B) The higher the number…the weaker the acid. So 4.5 to 5.5 is decreasing in acidity.
Clams & Snails

19. Acids are 0 to 6.9 on the pH scale
Questions
SPI
Acids and Bases
Acids
Acids are 0 to on the pH scale
Acids have a sour flavor The sour taste of lemons, limes, and other citrus fruits is a result of citric acid.