STUDY OF FLORAL ETHANOLIC EXTRACT OF THUNBERGIA LAURIFOLIA AS NATURAL ACID-BASE INDICATOR IN TITRIMETRIC ANALYSIS

An indicator is an important component in any titrimetric analysis because it gives a colour change at the end of the reaction, thus helping out to determine the end point. Most indicators used in laboratory are synthetic one i.e. they need to be synthesized by chemical reaction. Here we have simply used ethanolic floral extract of Thunbergia laurifolia i.e. no synthesis required. The filtered extract was used as alternative for acid-base indicators such as phenolphthalein. When burette reading of phenolphthalein was compared with floral extract graphically, it was similar. Thus the alcoholic floral extract of Thunbergia laurifolia can be used as a replacement for phenolphthalein indicator because it is cost effective and does not require chemical synthesis