Are bromothymol blue and thymol blue indicators? What is the difference?

Bromthymol blue and thymol blue are not an index, but there are three differences.

1, with different appearance.

Bromthymol blue: light rose crystal powder

Thymol Blue: Brown-green crystalline powder

2, PH test range is different

Bromthymol blue: Bromthymol blue is an acid-base indicator with a color change range of pH6.0 (yellow) to 7.6 (blue). Ordinary water is neutral, with a pH of around 7 and almost light green.

Thymol blue: The acidity range is pH 1.2 ~ 2.8, and it changes from red to yellow. The alkalinity ranges from pH 8.0 to 9.6, and from yellow to blue.

3. Different configuration methods

Bromthymol blue: add 1g bromothymol blue to 1l 20% ethanol solution, take 0. 1g bromothymol blue as indicator solution, add 4.3ml 0.05mol/L sodium hydroxide solution to dissolve it, and then add water to dilute it to 200mL.

Thymol blue: formed by condensation of thymol and o-sulfobenzoic anhydride.

Baidu encyclopedia-bromothymol blue

Baidu encyclopedia-thymol blue

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