Chart Of PH Indicator Ranges - The Science Company

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• pH Indicator Ranges

pH Indicator Ranges (Ascending pH)

Acid-base pH indicators are solutions that have a characteristic color at certain pH levels. They are used to visually signal the acidity or alkalinity of an aqueous (water-based) solution. pH indicators generally change color over a range of two pH units. They work only in colorless solutions in which a color change can be observed and can only give an approximate pH value. The table below gives a list of common laboratory pH indicators.

pH Range	Indicator
0.2 (red) - 1.8 (yellow) and 7.2 (yellow) - 8.8 (red)	Cresol Red
1.2 (red) - 2.8 (yellow) and 7.4 (yellow) - 9.0 (purple)	Cresolphthalein (meta)
1.2 (red) - 2.8 (yellow) and 7.4 (yellow) - 9.0 (purple)	Cresol Purple
1.2 (red) - 2.8 (yellow)	Thymol Blue
2.9 (purple) - 4.6 (green)	Methyl Orange - Xylene Cyanol
3.0 (yellow) - 4.6 (blue)	Bromophenol Blue
3.0 (blue) - 5.0 (red)	Congo Red
3.0 (red) - 6.3 (yellow)	Methyl Orange
4.0 (red) - 5.6 (yellow)	Alizarin Red S
4.0 (yellow) - 5.6 (blue)	Bromocresol Green
4.0 (colorless) - 6.6 (green)	Dichlorofluorescein
4.2 (pink) - 6.2 (yellow)	Methyl Red
4.6 (pink) - 5.2 (blue/green)	Bromocresol Green / Methyl Red
5.2 (yellow) - 6.6 (purple)	Bromocresol Purple
5.2 (yellow) - 6.8 (red)	Chlorophenol Red
6.0 (yellow) - 7.6 (blue)	Bromothymol Blue
6.8 (yellow) - 8.2 (red)	Phenol Red
7.3 (colorless/reddish) - 8.7 (blue/green)	Naphtholphthalein (alpha)
8.0 (colorless) - 10 (pink)	Phenolphthalein
8.2 (colorless) - 9.8 (violet/red)	Cresolphthalein (ortho)
8.8 (colorless) - 10.5 (blue)	Thymolthalein
11.6 (blue) - 14.0 (yellow)	Indigo Carmine