Thymol Blue, Indicator

Thymol Blue, Indicator

Thymol Blue is a pH indicator that undergoes a color change over a broad pH range, typically used for titration and pH testing. It is a sulfonphthalein dye that shifts color in response to changes in acidity or alkalinity. Thymol Blue is commonly employed in acid-base titrations and other applications where monitoring pH shifts is essential.

Specifications:

• Chemical Formula: C15H16O2S

• Molecular Weight: 272.35 g/mol

• Appearance: Solid, crystalline powder (typically yellowish)

• Solubility: Soluble in water, ethanol, and other organic solvents

• pH Range:

  • First transition: pH 1.2 to 2.8 (color change from red to yellow)

  • Second transition: pH 8.0 to 9.6 (color change from yellow to blue)

• Color Change:

  • At low pH (acidic): Red

  • At moderate pH: Yellow

  • At high pH (alkaline): Blue

• Concentration: Available in various concentrations for different applications (e.g., 0.1% solution)

• Stability: Stable at room temperature, but should be stored away from direct sunlight and in a tightly sealed container to avoid degradation

🧪 Uses:

• Acid-Base Titrations:

  • Used as a visual indicator in titrations, especially in cases where pH transitions occur within the acidic to slightly alkaline range (pH 1.2-9.6)

• pH Measurement:

  • Employed in the laboratory to determine the pH of aqueous solutions, particularly where a broad pH range is involved

• Chemical Analysis:

  • Used in quantitative chemical analysis where the pH shift needs to be observed over a broad range

• Aquarium and Environmental Testing:

  • Applied for monitoring water quality and aquatic environments where pH changes are important

• Biological Research:

  • Employed in various biological experiments requiring precise monitoring of pH shifts, particularly in microbial cultures

• Industrial Applications:

  • Can be used in process control in industries where pH balance is critical (e.g., water treatment or food production)