Title: The pH Scale
1The pH Scale
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 6(No Transcript)
7 8- 6. Conducts electricity (electrified pickle)
9Stomach acid
Battery acid
10 Characteristics of Acids
- Many are poisonous and corrosive to skin
11 Strong Acids (break down completely to
give off many H ions)
12Weak Acids (only partially breaks down, gives
less H)
Mark Bishop Acid animation
13 14- Corrosive (feels slippery)
15- Can also conduct electricity
16Characteristics of Bases
- Bases usually taste bitter
- 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
21Reactions 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.
22Reactions 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
23Neutralization
HCl NaOH ? H2O NaCl
acid base water salt
24Indicators
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