Bromophenol blue is colorless or light rose red fine crystal. Easily soluble in ethanol, benzene, ether and other organic solvents, slightly soluble in water, the aqueous solution is yellow, and it is blue purple in alkaline solution. It is mainly used as an acid-base indicator. The pH change range is 3.0~4.6. The color changes from yellow to blue purple through green. Bromophenol blue was used as colorless or light rose red fine crystal. It is mainly used as an acid-base indicator. The pH change range is 3.0~4.6. The color changes from yellow to blue purple through green. Chemical properties Colorless to reddish crystal or yellowish to brownish powder. Melting point 279 ℃ (decomposition). It is blue when dissolved in alcohol, dilute alkali solution and ammonia solution, yellow when slightly soluble in water and ether solution, and blue when its sodium salt is dissolved in water. Use Acid base indicator, pH 3.0 (yellow) - 4.6 (purple). Non aqueous solution titration indicator, protein electrophoresis staining, virus test, etc. Uses Used as acid base indicator Acid base indicator, indicator for nonaqueous solution titration, protein electrophoresis staining, virus assay, etc. Purpose Acid base indicator, pH discoloration range 3.0 (yellow)~4.6 (purple); The production method of adsorption indicator is to dissolve phenol red in glacial acetic acid, add bromine solution in glacial acetic acid under stirring, pour it into 60 ℃ hot water after stirring for a few minutes, cool it to room temperature, and place it overnight. Filter, wash the filter cake with glacial acetic acid and benzene in turn, and air dry to obtain bromophenol blue.
China
