Bromothymol Blue CAS 76-59-5, also known as bromothymol blue, is an acid-base indicator and adsorption indicator with the chemical formula C27H28O5SBr2. It is easily soluble in ethanol, ether, methanol, and dilute hydroxide alkali solutions. Slightly soluble in benzene, toluene, and xylene, slightly soluble in water, almost insoluble in petroleum ether. It is abbreviated as BTB in English. Commonly used as a respiratory reagent for aquatic organisms in biological experiments.

Chinese name: Bromothymol Blue

Foreign name: Bromothymol Blue; BTB

Nickname: Bromothymol Blue; Bromothymol blue

Chemical formula: C27H28O5SBr2

Molecular weight: 624.3812

CAS login number: 76-59-5

EINECS login number: 200-971-2

Melting point: 204 ℃

Boiling point: 640.2 ℃ at 760 mmHg

Slightly soluble

Density: 1.542 g/cm ³

Flash point: 341 ℃

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