Acids and Bases

1
Acids and Bases

• Vocabulary
• Acid
• Base
• pH
• Salt

2
Acids and Bases

• Objectives
• Compare the properties of acids, bases, and
  salts.
• Interpret measurements on the pH scale.
• Predict what salt will be formed from a
  neutralization reaction.

3
Acids and Bases

• Most people think of acids as harsh liquids that
  burn your skin and eat away at metal stone.
• Not all acids are harmful.
• You put many acids into your body when you eat.

4
Acids and Bases

• In chemical terms, an acid is a substance that
  gives up H ions in a water solution.
• A base is a substance that gives up or creates
  OH- ions in a water solution.
• Both acids and bases are important in making
  several products.

5
Acids and Bases

• Properties of Acids
• Sour taste
• Turn blue litmus paper red
• React with bases in a process called
  neutralization
• React with metals to form H2 gas
• Acids are classified as strong or weak

6
Acids and Bases

• Properties of Bases
• Bases have a bitter taste and a slippery feel
• Turn red litmus paper blue
• Classified as strong or weak bases
• React with acids in a process called
  neutralization

7
Acids and Bases

• When an acid and a base react a salt and water
  are formed.
• A salt is an ionic compound composed of a metal
  and a nonmetal.
• The metal part of the salt comes from the base
  and the nonmetal part from the acid.

8
Acids and Bases

• The pH scale is used to measure the strength of
  an acid or a base.
• The same scale of numbers is used for both acids
  and bases.
• Scale ranges from 0 14.
• Solutions with a pH lt 7 are acidic.
• Solutions with a pH gt 7 are basic.

9
Acids and Bases

• An indicator is often used to measure the pH of
  acids and bases.
• Some indicators are in solution form, others are
  added to strips of paper.

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Acids and Bases
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Acids and Bases