Tennessee SPI Objective:

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SPI 0807.9.12 Acids and Bases
Science
Notes
Tennessee SPI Objective Identify the basic
properties of acids and bases.
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Check for Understanding Determine whether a
substance is an acid or a base by its reaction to
an indicator.
Essential Question(s) What are the basic
properties of acids and bases? How can I use
indicators to determine if a substance is an acid
or a base?
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Bases
SPI 0807.9.12 Acids and Bases
Notes

• Baseswhat are they?
• A compound that increases negative hydroxide ions
  in water
• Have a bitter flavor, feels slippery, and can
  conduct electricity
• Bases neutralize acids and acids neutralize
  bases
• Common in everyday life (used in soaps and
  detergents)

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Common Bases
SPI 0807.9.12 Acids and Bases
Bases
Notes

• Toothpaste
• Detergent
• Ammonia
• Acid reducers

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SPI 0807.9.12 Acids and Bases
Quick Review
Bases

• Fill in the blanks using the following words
• slippery, hydroxide, bases, compound, bitter
• A base is a ___________that increases the number
  of _____________ions.
• Bases have a ______ flavor
• _________ neutralize acids.
• Bases feel __________ .

compound
hydroxide
bitter
Bases
slippery
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SPI 0807.9.12 Acids and Bases
Bases
Notes
The pH Scale

• pH scale a way to determine the level of acidity
  or basicity of
• a substance. (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
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More About The pH scale
SPI 0807.9.12 Acids and Bases
Bases
Notes

• Againbases are 7.1 to 14
• With bases, the higher the numberthe stronger
  the base
• Example a base with pH 14 is stronger than a
  base with pH 10

pH 14 is stronger than pH 10
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SPI 0807.9.12 Acids and Bases
Bases
Notes

• Reminder The pH scale can be displayed different
  ways.
• Yet the ranges for acids and bases stays the same
  
• (0 to 6.9 for acids, 7.1 to 14 for bases)

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SPI 0807.9.12 Acids and Bases
Quick Review
Bases

• Fill in the blanks using the following words
• higher, 7.1 to 14, strength, pH 13
• Which base is stronger, pH 13 or pH 8?
  ____________.
• The pH scale tells you the __________ of acids
  and bases.
• With acids the lower number is stronger. Yet with
  bases the _________ number is stronger.
• The pH range for bases is _________.

pH 13
strength
higher
7.1 to 14
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SPI 0807.9.12 Acids and Bases
Bases
Notes

• Bases Change Colors in Indicators

Examples of indicators litmus paper,
phenolphthalein, cabbage juice, and/or
bromthymol blue

• see following images

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SPI 0807.9.12 Acids and Bases
Bases
Notes
More About Bases and Indicators

• 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

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SPI 0807.9.12 Acids and Bases
Bases
Notes
12
Quick Review
SPI 0807.9.12 Acids and Bases
Bases

• Fill in the blanks using the following words
• blue, Indicators, No, acids
• ___________ change color in acids or bases
• Bases turn red litmus paper ______.
• ________ turn blue litmus paper red.
• Is litmus paper the only kind of indicator (yes
  or no?) ______

Indicators
blue
Acids
No