Do Now
• Take out your homework
• Update your table of contents:
Page # Title
125
Chemical equations quiz
126
Acids and Bases
Date
02/19
02/20
• Fold the colored sheet, hamburger style, and cut
the paper to make a two tab foldable.
• Attach the foldable to page 126.
• If I am checking your test corrections to
pull it up to a C, make sure you leave it
with me this weekend.
Acids and Bases
https://www.youtube.com/watch?v=WnPrtYUKke8
Acids and Bases
Acids are commonly found in
foods
Bases are commonly found in
household items
Acids form Hydronium Ions in Water
Bases form Hydroxide Ions in Water
Acids and Bases
• Acidic solutions have higher amounts
of hydronium ions. (pH lower than 7)
• Basic solution have higher amounts of
hydroxide ions. (pH greater than 7)
• A neutral solution has an equal
amount of hydronium and hydroxide
ions. (pH of 7)
Properties of Acids
• Sour taste
• They react with metals and
• Eat away at other materials (shoe
analogy)
• Turns blue litmus paper to a red color
• Hydronium ions can conduct
electricity
Properties of Bases
• Bitter taste
• Slippery feel (saponification – turn oils into
soap)
• Turns red litmus paper to a blue color
• Hydroxide ions can conduct electricity
Uses of Acids
• Lactic acid is found in milk
• Stomach acid assists in digestion
• Fruits and vegetable crops grow better in acidic
soil
• Acids are used to make plastics and fertilizers
• What other acids can you
think of?
Uses of Bases
• Antacids neutralize stomach acid to alleviate
heartburn
• Bases are used in cleaners (detergent, shampoo,
etc.)
• Some flowers grow better in basic soil
• Used to make soap, paper and rayon (fabric)
Sort the pieces to your foldable
• Categorize each piece to acids or bases
• Make sure you pick an example of a use for an
acid and base from today’s lesson.
• When you’re done, check with Ms. Lee and pick
up your HW: lesson outline to put on page 35
and use your textbook from page 471 to
complete the lesson outline.
Exit Slip
• What is a property of an acid? What ion does it
produce in water?
• What is a property of a base? What ion does it
produce in water?
Properties of Acids and Bases
pH
• pH is an inverse measure of hydronium ions in a
solution.
As hydronium ions…
pH will…
pH
• The lower the pH, the more acidic the solution
is.
(pH=below 7)
• The higher the pH, the more basic the solution
is.
(pH=above 7)
pH Scale
Indicator