1. pH scale
A. A measurement system to indicate the concentration of H+ (hydrogen ions)
1. The pH scale ranges from 0-14
2. Water is made up of H+ and OH- (hydroxide ions)
3. 7 represents a neutral solution- the number of H+ is equal to OH-

2. B. An acidic solution (acid) has more H+ than OH-.
1. An acidic solution would be anything less
than 7 the pH scale (further from neutral the stronger the acid)
2. An acidic solution would range in
color from yellow to red on pH paper
3. An acidic solution has a sour taste
4. Examples of acids
Acetic acid (vinegar)
Citric acid ( lemons)
Stomach acid ( HCl- hydrochloric acid)
(very strong acid)

3. C. A basic solution (base) would have more OH- than H+.
1. A basic solution is anything greater than 7 on the pH scale ( the further from 7 the stronger the base)
2. A basic solution ranges from green to dark blue on
pH paper
3. A basic solution has a bitter taste and a slippery
feel
4. Examples of bases
1. Ammonia (NaOH) (very strong base)
2.Bleach
3. Blood

4. What would happen if you mix a very strong acid with a very strong base?
HCl + NaOH ____ +_____
What is NaCl?
What is H2O?
H2O
NaCl

5. ACID BASE The pH Scale 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NEUTRAL RED
RED
YELLOW
LIGHT BLUE
DARK BLUE
ORANGE
vinegar
ammonia

6. Question #1
Lemon juice has a pH of 2.2. Is it an acid or a base?

7. Question #2
Detergents such as Tide have a pH of about 10. Is Tide an acid or a base?

8. Question #3
Seawater has a pH of 8.2. Is seawater an acid or a base?

9. Question #4
The inside of your mouth has a pH of 7. Is it an acid or a base?

10. Question #5
How do you think we came up with the term “acid rain”?