Acid-Base Indicators- Under Construction

Indicators Acid Color Range Color 
Methyl Violet yellow   0.0 - 1.6 blue 
Malachite Green    yellow 0.2 - 1.8 blue-green
Cresol red   red 1.0 - 2.0 yellow 
Thymol blue    red 1.2 - 2.8 yellow
Benzopurpurin 4B  violet  1.2 - 3.8  red 
Phloxine B  colorless  2.1 - 4.1  pink 
2,4-Dinitrophenol   colorless 2.8 - 4.0  yellow 
Methyl yellow (in ethanol)       
Bromophenol blue yellow      
Congo red blue       
       
       
       
       
       
       
       
       
       
       
       
       
       
       

 




Methyl yellow (in ethanol) red 2.9 - 4.0 yellow 
Bromophenol blue yellow 3.0 - 4.6 blue-violet 
Congo red blue 3.1 - 4.9 red 
Methyl orange red 3.2 - 4.4 yellow 
Bromocresol green yellow 4.0 - 5.6 blue 
alpha-Naphthyl red red 4.0 - 5.7 yellow 
Methyl red red 4.8 - 6.0 yellow 
Litmus (azolitmin) red 5.0 - 7.0 blue 
Bromocresol purple yellow 5.2 - 6.8 violet 
4-Nitrophenol colourless 5.4 - 6.6 yellow 
Bromothymol blue yellow 6.0 - 7.6 blue 
Phenol red yellow 6.4 - 8.0 red 
Brilliant yellow yellow 6.6 - 7.9 orange 
Cresol red yellow 7.0 - 8.0 red 
Metacresol purple yellow 7.4 - 9.0 violet 
2,6-Divanillyldenecyclohexanone yellow 7.8 - 9.4 red 
Thymol blue yellow 8.0 - 9.6 blue 
Phenolphthalein colourless 8.3 - 10.0 dark pink 
Ethyl bis (2,4-dinitrophenyl acetate) colourless 8.4 - 9.6 blue 
Thymolphthalein colourless 9.4 - 10.6 blue 
Alizarin yellow R yellow 10.0 - 12.0 red 
Malachite green hydrochloride green-blue 10.2 - 12.5 colourless 
Methyl blue blue 10.6 - 13.4 pale violet 
Sodium indigosulphonate blue 11.4 - 13.0 yellow 
Orange G yellow 11.5 - 14.0 pink 
2,4,6-Trinitrotoluene colourless 11.7 - 12.8 orange 
1,3,5-Trinitrobenzene colourless 12.0 - 14.0 orange 

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