1. Notes Science SPI 0807.9.12 Acids and Bases
SPI B
Bases
Learning Intention: Identify the basic properties of bases.
Purpose: to understand that many common substances contain bases
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 bases

2. …used in soaps and detergents
Bases…what are they?
A compound that increases negative hydroxide ions in water
Have a bitter flavor, feels slippery, and conducts electricity
Bases neutralize acids and acids neutralize bases
Common in everyday life (used in soaps and detergents)
Common in everyday life: for stomach aches and heartburn
…used in soaps and detergents
…used in acid reducers
(called antacids)

3. Other Common Uses of Bases
Drain Cleaners
Oven Cleaners
Batteries
Toothpaste
Ammonia

4. Bases Quick Review SPI 0807.9.12 Acids and Bases
Fill in the blanks using the following words…
slippery, hydroxide, bases, oven cleaners, compound, bitter
1) A base is a ___________that increases the number of _____________ions.
2) Bases have a ______ flavor
3) _________ neutralize acids.
4) Bases feel __________ .
5) Bases are found in _____________, batteries, antacids, drain cleaners, and tooth paste.
compound
hydroxide
bitter
Bases
slippery
oven cleaners

5. The pH Scale
pH scale: measures acidity or basicity (A.K.A. Alkalinity)
(tells you how strong or weak an acid or base is)
Bases are 7.1 to 14 on the pH Scale
7 is neutral (pure water is 7)
Bases are 7.1 to 14

6. Memory Trick Think of letter B. B for bases.
Again…bases are 7.1 to 14 on the pH scale.
With bases, the higher the number…the stronger the base.
Example: a base with pH 14 is stronger than a base with pH 10
Memory Trick
Think of letter B.
B for bases.
B for blue on litmus strips.
B for Bigger numbers.
On the pH scale, bases are the bigger numbers (7.1 to 14).
pH 14 is stronger than pH 10

7. 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

8. Fill in the blanks using the following words
Quick Review
SPI
Acids and Bases
Bases
Fill in the blanks using the following words
higher, 7.1 to 14, alkalinity, strength, pH 13
1) Which base is stronger, pH 13 or pH 8? ____________.
2) The pH scale tells you the __________ of acids and bases.
3) A synonym for basicity is _________________ .
4) With acids the lower number is stronger. Yet with bases the _________ number is stronger.
5) The pH range for bases is _________.
pH 13
strength
alkalinity
higher
7.1 to 14

9. Bases Change Colors in Indicators
Examples of Indicators:
litmus paper
cabbage juice
phenolphthalein
bromothymol blue

10. More About Bases and Indicators Bases turn Red litmus paper Blue.
One common indicator is litmus paper (see picture below)
Bases turn Red litmus paper Blue.
Memory Trick: B for Blue goes with B for Base

11. More About Bases and Indicators
Memory Trick: B for Blue goes with B for Base

12. Fill in the blanks using the following words…
Quick Review
SPI
Acids and Bases
Bases
Fill in the blanks using the following words…
blue, phenolphthalein, Indicators, No, acids
1) ___________ change color in acids or bases.
2) Bases turn red litmus paper ______.
________ turn blue litmus paper red.
4) Is litmus paper the only kind of indicator (yes or no?) ______
5) Cabbage juice, bromothymol, and _________________ are
other acid-base indicators.
Indicators
blue
Acids No
phenolphthalein

13. What is wrong with answer-choice A?
Bases are common in everyday life (used in soaps and detergents)
SPI
Acids and Bases
Science
Questions
What is wrong with answer-choice A?
Letter D
Base

14. Bases turn Red litmus paper Blue.
Bases conduct electric current: found in alkaline batteries
What’s wrong with letter B?
Acids release hydrogen gas when they react with metals.
Base do not react with metals.

15. What’s wrong with letter A?
Uses of Bases
Bases are 7.1 to 14
on the pH Scale
Oven Cleaners
Drain Cleaners
What’s wrong with letter A?
Bases do conduct electricity. Bases are in alkaline batteries.

16. What’s wrong with letter B? Bases are the bigger numbers!
It has a strong
likely pH of this cleaner?
Uses of Bases
Oven Cleaners
Bases are 7.1 to 14 on the pH Scale.
With bases, higher numbers are stronger.
What’s wrong with letter B?
Acids are 0 to 6.9 on the pH scale.
Bases are the bigger numbers!
(7.1 to 14)

17. What’s wrong with letter A?
In phenolphthalein, bases turn pink.
Acids form hydronium ions.
Also, bases form hydroxide ions.
Reminder: HydoniYUM!
Base
Phenolphthalein
Pink
Phenolphthalein
Pink