Different acid-base indicators & their color changes depending on the pH Flashcards
Methyl violet
pH?
0-1
1.5
Methyl violet
color?
Yellow to violet
Thymol blue
pH? (acid range)
1-2
2.5
Thymol blue
pH? (base range)
8-9
9.5
Thymol blue
color? (acid range)
Red to yellow
Thymol blue
color? (base range)
Yellow to blue
Methyl orange
pH?
3-4
4.5
Methyl orange
color?
Red to yellow orange
Bromcresol green
pH?
3-6
overreached 3, almost 6
Bromcresol green
color?
Yellow to blue
Methyl red
pH?
4-6
4, almost 6. or 6
Methyl red
color?
Red to yellow
Chlorphenol red
pH?
5-7
overreached 5, almost 7
Chlorphenol red
color?
Yellow to Red
Bromthymol blue
pH?
6-almost 8
Bromthymol blue
color?
Yellow to blue
Phenol red
pH?
6-8
overreached 6
Phenol red
color?
Yellow to Red
Phenolphthalein
pH?
8-10
Phenolphthalein
color?
Colorless to Red
Thymolphthalein
pH?
9-10
overreached 10, but not almost 11
Thymolphthalein
color?
Colorless to blue
Alizarin Yellow
pH?
10-12
Alizarin Yellow
color?
Yellow to violet
