Phenolsulfonphthalein

Phenolsulfonphthalein is a chemical compound used as a pH indicator in applications such as medicine and biology. It is commonly known as phenol red due to its red color in alkaline solutions.

Chemical Properties

Phenolsulfonphthalein is a weak acid that changes color over a pH range of 6.8 to 8.2. Above pH 8.2, phenolsulfonphthalein will appear red, while below pH 6.8, it will appear yellow. At the midpoint of the pH range, the indicator will appear orange.

Uses

Phenolsulfonphthalein is primarily used as a pH indicator in various scientific and medical applications. In medicine, it is used in the phenolsulfonphthalein test to measure the kidney's ability to secrete acid. In biology, it is used in cell culture media to indicate the pH of the medium.

Safety

Phenolsulfonphthalein is not considered to be particularly hazardous, but it can cause irritation if it comes into contact with the skin or eyes. It is recommended to handle it with care and use appropriate personal protective equipment.

See Also

• pH indicator
• Phenolsulfonphthalein test
• Kidney function test