Phenolphthalein

Phenolphthalein is an organic compound with the chemical formula C20H14O4. It is a weak acid that is often used as an indicator in acid-base titrations. In acidic solutions, phenolphthalein is colorless. However, in basic solutions, it turns pink. This change in color is due to the deprotonation of phenolphthalein, which forms a pink anion.

The pH range at which phenolphthalein changes color is from 8.2 to 10.0. This makes it a good indicator for titrations that involve bases with a pH in this range. For example, phenolphthalein can be used to titrate sodium hydroxide (NaOH) against hydrochloric acid (HCl).

In addition to its use as an indicator, phenolphthalein has also been used as a laxative. However, it is no longer recommended for this purpose due to its potential to cause kidney damage.

Here are some additional properties of phenolphthalein:

• It is a white, odorless, and tasteless solid.
• It is soluble in water and alcohol.
• It is stable at room temperature.
• It is non-toxic in small doses.

Phenolphthalein is a versatile compound with a variety of uses. It is a valuable tool for chemists and it has also been used in the medical field. However, it is important to note that phenolphthalein can be harmful in high doses.