Use of Flower Extracts as an Indicator in Acid-Base Titrations

Today synthetic indicators are the choice of acid-base titrations. But due to environmental pollution, availability and cost, the search for natural compounds as an acid-base indicator was started. The present work highlights the use of the acidified methanolic extract of the flowers of few medicinal plants as an acid-base indicator in acid-base titrations. This natural indicator is easy to extract as well as easily available. Promising results were obtained when it was tested against standard synthetic indicators. Titration shows sharp colour change at the equivalence point. This indicator was found to be useful in all type of acid-base titrations except weak acid and weak base titration. It was found very useful, economical, simple and accurate indicator for said titrations.