Page 294 - Vogel's TEXTBOOK OF QUANTITATIVE CHEMICAL ANALYSIS
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Table 10.1 Colour changes and pH range of certain indicators
lndicator Chemical name pH range Colour in Colour in
acid alkaline
solution solution
Brilliant cresyl blue (acid) Aminodiethylaminomethyldiphenazonium chloride Red-orange Blue
Cresol red (acid) 1-Cresolsulphonphthalein Red Yellow
m-Cresol purple m-Cresolsulphonphthalein Red Yellow
Quinaldine red 1-(p-Dimethylaminophenylethylene)quinoline ethiodide Colourless Red
Thymol blue (acid) Thymolsulphonphthalein Red Yellow
Tropaeolin 00 p-Anilinophenylazobenzenesulphonic acid sodium salt Red Yellow
Bromophenol blue Tetrabromophenolsulphonphthalein Yellow Blue
Ethyl orange Red Orange
Methyl orange Dimethylaminophenylazobenzenesulphonic acid sodium salt Red Orange
Congo red Diphenyldiazobis-1-naphthylaminesulphonic acid disodium salt Blue Red
Bromocresol green Tetrabromo-m-cresolsulphonphthalein Yellow Blue
Methyl red 1-Carboxybenzeneazodimethylaniline Red Yellow
Ethyl red Red Orange
Chlorophenol red Dichlorophenolsulphonphthalein Yellow Red
4-Nitrophenol 4-Nitrophenol Colourless Yellow
Bromocresol purple Dibromo-O-cresolsulphonphthalein Yellow Purple
Bromophenol red Dibromophenolsulphonphthalein Yellow Red
Azolitmin (litmus) - Red Blue
Bromothymol blue Dibromothymolsulphonphthalein Yellow Blue
Neutra1 red Aminodimethylaminotoluphenazonium chloride Red Orange
Phenol red Phenolsulphonphthalein Yellow Red
Cresol red (base) 1-Cresolsulphonphthalein Yellow Red
1-Naphtholphthalein 1-Naphtholphthalein Yellow Blue
m-Cresol purple m-Cresolsulphonphthalein Yellow Purple
Thymol blue (base) Thymolsulphonphthalein Yellow Blue
O-Cresolphthalein Di-O-cresolphthalide Colourless Red
Phenolphthalein Phenolphthalein Colourless Red
Thymolphthalein Thymolphthalein Colourless Blue
Alizarin yellow R p-Nitrobenzeneazosalicylic acid Yellow Orange-red
Brilliant cresyl blue (base) Aminodiethylaminomethyldiphenazonium chloride Blue Yellow
Tropaeolin O p-Sulphobenzeneazoresorcinol Yellow Orange
Nitramine 2,4,6-Trinitrophenylmethylnitroamine Colourless Orange-brown
