Page 293 - Vogel's TEXTBOOK OF QUANTITATIVE CHEMICAL ANALYSIS
P. 293
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
