Flower extract as an improvised indicator in acid – base titration

Abstract

Different flowers were collected and the extracts were tested for indicator properties in acidic and basic solutions. The results showed different colour changes in alkaline and colourless in acid solutions. When used in acid-base titration, the end points colours and the average titre values obtained matched with that of standard phenolphthalein indicator. The finding indicates an alternative way of enriching laboratory practical with an instructional material that is useful, economical, simple and accurate for the said titration. Therefore, it is recommended for integrated science and chemistry instructions.

Keywords: Flower, acid, base, indicator, titration.