Some Acid-Base Indicators
yellow to blue
red to yellow
red to yellow
red to yellow
yellow to blue
red to yellow
yellow to red
yellow to blue
yellow to red
red to amber
yellow to blue
colorless to pink
colorless to blue
yellow to blue
blue to yellow
red to yellow
red to yellow
red to yellow
yellow to blue
red to yellow
yellow to red
yellow to blue
yellow to red
red to amber
yellow to blue
colorless to pink
colorless to blue
yellow to blue
blue to yellow
0.0 -
1.6
1.2 - 2.8
1.4 - 2.8
3.2 - 4.4
3.8 - 5.4
4.8 - 6.2
5.2 - 6.8
6.0 - 7.6
6.6 - 8.0
6.8 - 8.0
8.0 - 9.6
8.2 - 10.0
9.4 - 10.6
10.1 - 12.0
11.4 - 13.0
1.2 - 2.8
1.4 - 2.8
3.2 - 4.4
3.8 - 5.4
4.8 - 6.2
5.2 - 6.8
6.0 - 7.6
6.6 - 8.0
6.8 - 8.0
8.0 - 9.6
8.2 - 10.0
9.4 - 10.6
10.1 - 12.0
11.4 - 13.0
Crystal violet
Thymol blue
Orange IV
Methyl orange
Bromcresol green
Methyl red
Chlorophenol red
Bromthymol blue
Phenol red
Neutral red
Thymol blue
Phenolphthalein
Thymolphthalein
Alizarin yellow
Indigo carmine
Thymol blue
Orange IV
Methyl orange
Bromcresol green
Methyl red
Chlorophenol red
Bromthymol blue
Phenol red
Neutral red
Thymol blue
Phenolphthalein
Thymolphthalein
Alizarin yellow
Indigo carmine
Color Change
as pH Increases
as pH Increases
pH Range in
which
Color Change Occurs
Color Change Occurs
Indicator