Cresol Red

Cresol Red

Cresol Red chemical structure

Cresol Red is a pH indicator dye commonly used in laboratory settings. It belongs to the class of sulfonphthalein dyes and is known for its ability to change color depending on the pH of the solution it is in. Cresol Red is often used in biological and chemical experiments to determine the acidity or alkalinity of a solution.

Chemical Properties

Cresol Red has the chemical formula C21H18O5S and a molecular weight of 382.43 g/mol. It is a red crystalline powder that is sparingly soluble in water but soluble in organic solvents such as ethanol and acetone. The dye undergoes a reversible color change from yellow at pH 1.2 to red at pH 2.0, making it a useful indicator in the acidic range.

Uses

Cresol Red has various applications in different fields:

1. Laboratory Research: Cresol Red is commonly used as a pH indicator in laboratory experiments. Its color change allows researchers to determine the pH of a solution accurately. It is particularly useful in titrations and other analytical procedures.

2. Biological Studies: In biological research, Cresol Red is used to monitor pH changes in cell cultures and other biological systems. It can be incorporated into growth media to assess the metabolic activity of cells and the effects of pH on cellular processes.

3. Quality Control: Cresol Red is also employed in quality control processes, especially in the food and beverage industry. It helps determine the pH levels of various products, ensuring they meet the required standards.

Safety Considerations

While Cresol Red is generally considered safe to use in laboratory settings, it is essential to handle it with care. It is recommended to wear appropriate personal protective equipment, such as gloves and goggles, when working with this dye. Additionally, proper ventilation should be ensured to avoid inhalation of its dust or vapors.

See Also

• pH indicator
• Sulfonphthalein dyes
• Laboratory equipment
• Chemical compounds