pH scale

1
pH scale
measures acidity/basicity
ACID
BASE
10x
10x
10x
100x
0 1 2 3 4 5 6
7 8 9 10 11 12 13
14
NEUTRAL
Each step on pH scale represents a factor of 10.
pH 5 vs. pH 6 (10X more acidic)
pH 3 vs. pH 5 (100X different)
pH 8 vs. pH 13 (100,000X different)
2
pH scale
measures acidity/basicity
Søren Sorensen (1868 - 1939)
ACID
BASE
10x
10x
10x
100x
0 1 2 3 4 5 6
7 8 9 10 11 12 13
14
NEUTRAL
Each step on pH scale represents a factor of 10.
pH 5 vs. pH 6 (10X more acidic)
pH 3 vs. pH 5 (100X different)
pH 8 vs. pH 13 (100,000X different)
3
Richter Scale - Earthquakes
6
5
7
.
3
4
1
2
4
pH -log H1
Acid
Base
pH 7
H
OH-
Acidic
Basic
Neutral
5
radius 112.8 cm
radius 35.7 cm
radius 11.3 cm
radius 3.6 cm
radius 1.1 cm
radius 0.1128 cm
.
pH 2
pH 3
pH 1
.
pH 4 5 6