1. Acids
and
Bases

3. Understanding Acids and
Bases
Distilled Water 7 - ish Saliva 6 -7.4
Tap Water 7.5-8 Battery Acid .5-1
Baking Soda 8.5 - 9 Stomach Acid .5-1
Lemon Juice 2.5-3 Milk 6.5
Normal Rain 5.6-6.5 Ammonia 11-12
Vinegar 2.5-3 Orange Juice 3.5
Drain Cleaner 12 - 14 Cola 2.5-4
(NaOH)

4. Putting it all Together

5. Characteristics of Acids
 Taste sour
 pH less than 7
 Corrode Metal
 Conduct electricity very well

6. Characteristics of Bases
 pH greater than 7
 Taste bitter
 Good Cleaners
 Feel slippery

7. Understanding the pH
Scale
Acidic Basic
0 7 14
Neutral
•The pH scale is a logrithmic scale.
•A difference of one pH unit represents a tenfold change
•A difference of 2 pH units, for example from 6 to 4, would mean that
the acidity one hundred times greater.

8. Check Your
Understanding
How many times more acidic is a
tomato than coffee?
10
How many times more acidic is
tomato than saliva?
100
How many times more acidic is lemon
juice than coffee?
1,000