Bromocresol green in solid form and as solution at pH < 3.8 (yellow), pH 3.8-5.4 (green) and pH > 5.4 (blue)
| Other names
|Molar mass||698.01 g/mol|
|Appearance||Light brown powder|
|Boiling point||225 °C (437 °F; 498 K) (decomposes)|
|Solubility|| Very soluble in acetone, aq, ammonia, diethyl ether, ethanol|
Soluble in benzene
Sparingly soluble in chloroform, isopropanol
Insoluble in glycerol, hexane
|Vapor pressure||~0 mmHg|
|Safety data sheet||AcrosOrganics|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Bromocresol green (IUPAC: 2,6-dibromo-4-[7-(3,5-dibromo-4-hydroxy-2-methyl-phenyl)-9,9-dioxo-8-oxa-9λ6-thiabicyclo[4.3.0]nona-1,3,5-trien-7-yl]-3-methyl-phenol) is an organic chemical compound, used as a dye and pH indicator in applications such as growth mediums for microorganisms and titrations. It has the formula C21H14Br4O5S.
Bromocresol green will turn yellow at low pH and blue at high pH.
Can be purchased from chemical suppliers or online.
Best to purchase it.
- pH indicator
- Tracking dye
Bromocresol green may stain, though its low water solubility limits this effect. No data is currently available for its toxicity.
Bromocresol green is best kept in closed bottles, away from acids and ammonia.
Adding a strong oxidizing solution, such as chromic acid, Fenton's reagent or piranha solution will slowly break it down to carbon dioxide, water, sulfur dioxide and bromine. Neutralize it with an alkaline base and then pour it down the drain.