What is phenolphthalein?

Phenolphthalein is recognized as a pH indicator solution, commonly used in titrations and pH testing. It is colorless in acidic solutions and turns pink as the pH approaches 8.2 to 10, indicating a transition from acidic to more alkaline conditions. This distinct color change makes phenolphthalein a useful tool for determining the acidity or alkalinity of a solution, allowing analysts to gauge the pH without needing sophisticated equipment.

In addition to its practical application, understanding how phenolphthalein functions also contributes to broader knowledge in analytical chemistry, including acid-base reactions and the behavior of indicators in various chemical environments. Its usage is fundamental in laboratories dealing with water quality testing, aligning perfectly with the responsibilities of a drinking water laboratory analyst.