Thymol blue is a pH indicator used to visually determine the acidity or basicity of a solution. It changes color at different pH levels, making it a useful tool in chemistry and other scientific fields.

 Thymol blue is a pH indicator used to visually determine the acidity or basicity of a solution. It changes color at different pH levels, making it a useful tool in chemistry and other scientific fields. 

Here's a more detailed explanation:

Color Changes:

Thymol blue exhibits three distinct colors in aqueous solutions, depending on the pH. 

Acidic (pH < 1.2): Red or magenta 

Neutral (pH 1.2 - 8.0): Yellow 

Basic (pH > 8.0): Blue 

Transition Points:

The color changes occur within specific pH ranges: 

Red to Yellow: Around pH 1.2 - 2.8 

Yellow to Blue: Around pH 8.0 - 9.6 

Applications:

Thymol blue is commonly used in titrations, water quality testing, and as a component of universal indicator solutions. 

Solubility:

Thymol blue is poorly soluble in water but dissolves in alcohol and dilute alkali solutions.