An Investigation of Antigonon leptopus Hook. & Arn. as Natural pH Indicator in Acid-Base Titrations

M. U. Ghurde, P. S. Aswar

Abstract: Synthetic pH indicators are usually employed in acid-base titrimetric analysis to identify the end point. However, there are a number of significant challenges with synthetic pH indicators, such as the potential toxicity, carcinogenicity, and non-biodegradability, which raises issues with the environment and public health. The present study aimed to substitute natural indicators for synthetic ones. This study deals with a search of plants as a natural source serving as eco-friendly acid-base (pH) indicators. Strong acid (SA) vs. strong base (SB) and strong acid (SA) vs. weak base (WB) titrations were used to assess potential of the three different extracts (distilled water, boiled water and ethanol) of Antigonon leptopus flower. Natural indicators exhibit promising results and a sharp and intense colour change near the neutralization point when titrated against available synthetic acid-base indicators such as methyl orange and phenolphthalein. Since these sources readily available, non-toxic, simple to extract, environmentally friendly, and accurate in many kinds of acid-base titrations, these natural indicators may be a great substitute for synthetic ones.

Keywords: Antigonon leptopus flower, Distilled water, boiled water, ethanol, natural and synthetic indicators

How to Cite?: M. U. Ghurde, P. S. Aswar, "An Investigation of Antigonon leptopus Hook. & Arn. as Natural pH Indicator in Acid-Base Titrations", Volume 14 Issue 7, July 2025, International Journal of Science and Research (IJSR), Pages: 456-459, https://www.ijsr.net/getabstract.php?paperid=SR25704141743, DOI: https://dx.doi.org/10.21275/SR25704141743