Studies of Eco- friendly natural acid-base pH indicators properties of two flowering plants from Adi-Nifas and Mai-Nefhi Eritrea

Abstract

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 vocation highlights the exploit of the aqueous extract of the flowers of Catharanthus rosea and Nerium oleander as an acid base indicator in acid base titrations. Natural indicators are easy to prepare as well as they are easily available. Promising results were obtained when they were tested against standard synthetic indicators. Titration shows sharp color change with respect to change in pH at the equivalence point. The equivalence points obtained from the flower extracts coincide with the equivalence point points obtained by the standard indicators. Thus natural indicators are found to be a very useful, economical, simple and accurate for the said titration.