It is mainly applied as an indicator in acidbase titration experiments to detect the end point of a chemical reaction. It is widely used in school laboratories research laboratories pharmaceutical testing and industrial chemical analysis.

The purpose of this solution is to show whether a solution is acidic or basic by changing its color. It remains colorless in acidic solutions and turns pink or light purple in alkaline (basic) solutions.

Phenolphthalein Indicator 1% Solution in Ethanol is prepared by dissolving 1 gram of phenolphthalein in 100 mL of ethanol or ethanol-based solvent. It is a clear colorless liquid with high sensitivity to pH changes and is commonly stored in tightly closed bottles away from heat and flames because ethanol is flammable.