Cliffs AP Chemistry, 3rd Edition

(singke) #1

Appendix B: Acid-Base Indicators


Range Indicator Lower Color Upper Color
0.0−2.5 Methyl violet Yellow-green Violet
0.5−2.0 Malachite green HCI Yellow Blue


  1. 0−2.8 Thymol blue Red Yellow

  2. 2−4.0 Benzopurpurin Violet Red

  3. 3−3.0 Orange IV Red Yellow

  4. 5−2.6 Naphthol yellow S Colorless Yellow
    2.1−2.8 p-Phenylazoaniline Orange Yellow
    2.5−4.4 Methyl orange Red Yellow
    3.0−4.7 Bromophenol blue Orange-yellow Violet
    3.0−5.0 Congo red Blue Red
    3.5−6.3 Gallein Orange Red
    3.8−5.4 Bromcresol green Yellow Blue
    4.0−5.8 2,5- Dinitrophenol Colorless Yellow
    4.2−4.6 Ethyl orange Colorless Yellow
    4.4−6.2 Methyl red Salmon Orange
    4.5−8.3 Litmus Red Blue
    4.8−6.2 Chlorphenol red Yellow Red
    5.1−6.5 Propyl red Pink Yellow
    5.4−6.8 Bromocresol purple Green-yellow Violet
    5.6−7.2 Alizarin Yellow Red
    6.0−7.6 Bromthymol blue Yellow Blue
    6.0−7.6 Bromoxylenol blue Orange-yellow Blue
    6.4−8.2 Phenol red Yellow Red-violet
    7.1−8.8 Cresol red Yellow Violet

  5. 5−9.0 m-cresol purple Yellow Violet
    8.1−9.5 Thymol blue Yellow Blue
    8.3−10.0 Phenolphthalein Colorless Dark pink
    8.6−9.8 o-Cresolphthalein Colorless Pink


8684-X AppB.F 2/9/01 8:28 AM Page 391

Free download pdf