25.1 Acids, Bases, and pH - PowerPoint PPT Presentation

1 / 13
About This Presentation
Title:

25.1 Acids, Bases, and pH

Description:

25.1 Acids, Bases, and pH Key Question: What is pH? *Read text section 25.1 AFTER Investigation 25.1 – PowerPoint PPT presentation

Number of Views:65
Avg rating:3.0/5.0
Slides: 14
Provided by: inst148
Category:
Tags: acids | bases

less

Transcript and Presenter's Notes

Title: 25.1 Acids, Bases, and pH


1
25.1 Acids, Bases, and pH
  • Key Question
  • What is pH?

Read text section 25.1 AFTER Investigation 25.1
2
25.1 Acids, Bases, and pH
  • Your stomach secretes one of the stronger acids,
    hydrochloric acid (HCl).
  • As acidic solutions of digested food leave your
    stomach, other organs in your digestive system
    secrete bicarbonate, a base.
  • The added base neutralizes the strong, corrosive
    acid.

3
25.1 Acids, Bases, and pH
  • Acids
  • An acid is any substance that produces hydronium
    ions (H3O) when dissolved in water.
  • They react with metals to produce hydrogen gas
    (H2)
  • They change the color of a plant dye (called
    litmus) from blue to red.

4
25.1 Acids, Bases, and pH
  • Bases
  • A base is any substance that produces hydroxide
    ions (OH-) when dissolved in water.
  • While you should never touch a laboratory
    chemical, the bases you use every day such as
    soap, have a slippery feel.
  • They change the color of litmus from red to blue.

5
25.1 Electrolytes and non-electrolytes
  • Electrolytes conduct current.
  • All acids and bases are electrolytes because they
    contribute ions to a solution.
  • Other chemicals do not form ions when they are
    dissolved in solution. They are called
    non-electrolytes.
  • Non-electrolytes are not acidic or basic.
  • Sugar dissolved in water is an example of a
    non-electrolyte.

6
(No Transcript)
7
25.1 Acids and bases in your body
  • It is very important for your blood pH to stay
    within the normal range.
  • The rate at which you breathe controls the
    concentration of carbon dioxide in your blood.

8
25.2 Acid Rain
  • Any rain, snow, or fog that has a pH lower than
    5.6 is called acid rain or acid precipitation.

9
25.2 Acid Rain
  • Acid rain is harmful to natural environments
    because most life and life processes function in
    nearly neutral environments.
  • Acid rain reduces the amount of calcium in the
    soil.

10
25.2 Catalytic converter
  • A catalytic converter is a device that converts
    nitrogen oxide to nitrogen gas (N2) and oxygen
    (O2) before these emissions enter the atmosphere.

11
(No Transcript)
12
25.2 Acid Rain
  • Key Question
  • What is acid rain?

Read text section 25.2 BEFORE Investigation 25.2
13
25.2 Acid Rain
  • Key Question
  • What is acid rain?

Read text section 25.2 BEFORE Investigation 25.2
Write a Comment
User Comments (0)
About PowerShow.com