Natural Dyes as pH indicator: a review

Abstract

This review emphasizes the significance of pH indicators in the field of analytical chemistry by employing extracts obtained from plants. The use of synthetic dye prepared industrially is known for its high energy receipt, which in a way contributes to environmental pollution. A pH indicator is a dye that might be synthetic or natural and has versatile applications. Efforts are being made to develop natural indicators by utilizing various flower and other plants extracts.. The study demonstrates the ability to use flower extracts as acid-base indicators in acid-base titrations. Natural indicators are readily available, easy to prepare, and yet showed promising results compared to synthetic indicators. The titration using flower extracts exhibits a clear color change at the specified points, which is consistent with the results obtained from standard indicators. Natural indicators are deemed highly valuable, cost-effective, straightforward, and precise for such titrations. also, it considered a green chemistry. The method employed in industrial processes for chemical reactions is defined by its focus on energy efficiency and its effort to minimize the utilization of hazardous or toxic solvents and reagents whenever feasible.