Acid-Base Indicators

IndicatorAcid ColorPh RangeBase Color
Methyl Violetyellow0.0-1.6blue
Malachite greenyellow0.2-1.8blue-green
Cresol redred1.0-2.0yellow
Thymol bluered1.2-2.8yellow
Benzopurpurin 4Bviolet1.2-3.8red
Orange IVred1.4-2.6yellow
Phloxine Bcolorless2.1-4.1pink
2,4-Dinitrophenolcolorless2.8-4.0yellow
Methyl yellow (in ethanol)red2.9-4.0yellow
Bromophenol blueyellow3.0-4.6blue-violet
Congo redblue3.1-4.9red
Methyl orangered3.2-4.4yellow
Bromocresol greenyellow4.0-5.6blue
alpha-Naphthyl redred4.0-5.7yellow
Methyl redred4.8-6.0yellow
Litmus (azolitmin)red5.0-7.0blue
Bromocresol purpleyellow5.2-6.8violet
4-Nitrophenolcolorless5.4-6.6yellow
Bromothymol blueyellow6.0-7.6blue
Phenol redyellow6.4-8.0red
Brilliant yellowyellow6.6-7.9orange
Cresol redyellow7.0-8.0red
Metacresol purpleyellow7.4-9.0violet
2,6-Divanillyldenecyclohexanoneyellow7.8-9.4red
Thymol blueyellow8.0-9.6blue
Phenolphthaleincolorless8.3-10.0dark pink
Ethyl bis (2,4-dinitrophenyl acetate)colorless8.4-9.6blue
Thymolphthaleincolorless9.4-10.6blue
Alizarin yellow Ryellow10.0-12.0red
Malachite green hydrochloridegreen-blue10.2-12.5colorless
Methyl blueblue10.6-13.4pale violet
Sodium indigosulphonateblue11.4-13.0yellow
Orange Gyellow11.5-14.0pink
2,4,6-Trinitrotoluenecolorless11.7-12.8orange
1,3,5-Trinitrobenzenecolorless12.0-14.0orange