The pH Scale - PowerPoint PPT Presentation

1 / 25
About This Presentation
Title:

The pH Scale

Description:

Acids have a sour taste. Acids react with metals. Acids contain Hydrogen ... Bases usually taste bitter. Bases feel slippery. Bases contain hydroxide ions ... – PowerPoint PPT presentation

Number of Views:95
Avg rating:3.0/5.0
Slides: 26
Provided by: mayaa
Category:
Tags: scale

less

Transcript and Presenter's Notes

Title: The pH Scale


1
The pH Scale
  • Acids and Bases

2
  • pH measures hydronium ions (H3O)

3
  • Comparative concentrations

4
  • Concentration changes by powers of 10
  • pH 1 has 10x more than pH 2
  • pH 1 has 100x more than pH 3
  • More ?? Less
  • 1 2 3 4 5 6 7 8 9 10 11 12
    13 14

5
  • Acids
  • Taste sour

6
(No Transcript)
7
  • It Burns skin and tissue

8
  • 6. Conducts electricity (electrified pickle)

9
  • Examples

Stomach acid
Battery acid
10
Characteristics of Acids
  • Acids have a sour taste
  • Acids react with metals
  • Acids contain Hydrogen
  • Many are poisonous and corrosive to skin

11
Strong Acids (break down completely to
give off many H ions)
12
Weak Acids (only partially breaks down, gives
less H)
Mark Bishop Acid animation
13
  • Bases
  • Tastes Bitter

14
  • Corrosive (feels slippery)

15
  • Can also conduct electricity

16
Characteristics of Bases
  • Bases usually taste bitter
  • Bases feel slippery
  • Bases contain hydroxide ions
  • STRONG bases are also poisonous and corrosive to
    skin

OH-
17
  • Detergents basic
  • lather in hard water
  • do not form soap scum

18
  • Soap basic
  • surrounds oily substances
  • allows emulsion in water
  • Whisked away!

19
  • Ammonia basic
  • emulsifies oil
  • whisked away!

20
  • Bleach basic
  • Disinfectant
  • kill bacteria viruses

21
Reactions between acids and bases
When and acid and a base react with each other,
the characteristic properties of both are
destroyed. This is called neutralization.
22
Reactions between acids and bases
General formula for acid base reaction
Acid

Base
?
Salt
H2O

NOT JUST NaCl !!
Salt means any ionic compound formed from an
acid/base reaction
Neutralization Reaction Animation
23
Neutralization
HCl NaOH ? H2O NaCl
acid base water salt
24
Indicators
An indicator is a compound that will change color
in the presence of an acid or base
  • Red Litmus-Turns blue in base
  • Blue Litmus-Turns red in acid
  • Universal indicator (pH paper) Used for the
    full pH range
  • Phenolphthalein-Turns pink in base

25
  • Thanks to the following people who have
    generously shared their images on the creative
    commons of Flickr
  • ProgoddessI love lemon peppermint
  • Frotzed2 gave your kid a lemon ?
  • Bunchofpants pickle on a fork
  • Brad Lauster Big Papa
  • G.J. Charlet III hey kool-aid!
  • Interplast acid burn
  • Duchamp electric pickle
  • Deanj Old ray-o-vacs
  • Wallyg Homer!!
  • Jemsweb walnut
  • Greg McElhatton unsweetened chocolate
  • Santoslilhelper slippery when wet
Write a Comment
User Comments (0)
About PowerShow.com