Bromothymol Blue, CAS 76-59-5 also known as bromothymol blue BTB, is an acid-base indicator and adsorption indicator with the chemical formula of C27H28O5SBr2, which is easily soluble in ethanol, ether, methanol and dilute alkaline hydroxide solution. Slightly soluble in benzene, toluene and xylene, slightly soluble in water, almost insoluble in petroleum ether. The English abbreviation is BTB. It is often used as a respiratory reagent for aquatic organisms in biological experiments.
How to make its solution
Add 1g bromothymol blue to 1L 20% alcohol solution
Bromothymol blue indicator solution: Take 0.1g of bromothymol blue, add 3.2mL of 0.05mol/L sodium hydroxide solution to dissolve it, and then add water to dilute it to 200mL. [3] Color change range pH1.2-2.8 (red to yellow); PH8.0-9.6 (yellow purple blue).
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