Abstract

EXTRACTION AND EVALUATION OF ECO-FRIENDLY ACID-BASE INDICATOR

Mohit Gupta* and Nita Yadav

Abstract

The present research work based on extraction and evaluation of a natural environment friendly source of acid-base indicator, Lagerstroemia species. Giant crape myrtle petals were freshly collected from local medicinal garden and were thoroughly washed with distilled water, cut in small pieces and macerated by using mortar & pestle. The whole macerated material was transferred into a 250 ml iodine flask containing methanol. It was kept away from light for 24 hours to permit appropriate extraction after which the solution was sifted and the filtrate was gathered for the titrations. The filtrate from the extraction was used as natural indicator, while the synthetic indicator phenolphthalein and methyl orange were used as standard. This natural indicator is easily available as well as easy to extract. Promising results were observed when it was analyzed against standard indicators. Titration indicates sharp color change at the equivalence point. This indicator observed to be valuable in all kinds of acidbase titrations. It found very helpful, affordable, suitable and fundamental indicator for acidbase titrations.

Keywords: Extraction, Acid-base indicator, Lagerstroemia speciosa, Phenolphthalein.