Jambolan fruit peels (syzygium cumini l. skeels) as substitute for synthetic acid base indicators: Implementation of the ESD concept

Abstract

Implementation of Education for Sustainable Development (ESD) can be done by implementing several strategies such as integrating the three pillars of ESD to learning material and adopting the principles of green chemistry in learning. In this study, the use of renewable materials with safe solvents to extract jambolan fruit peels as a substitute for synthetic indicators has been carried out. The results of measuring the absorbance value at wavelength 507-528 showed that the jambolan fruit peels was extracted optimally in the solvent mixture double distilled water : ethanol with a ratio of 1 : 2 at pH 2. Under these conditions, maceration was carried out 24 h three times and then evaporated and extracted using n-hexane and chloroform solvents. Extracts that have been tested under various pH, ranging from 1 to 14, and titration methods were then used in learning activities to determine the level of CH3COOH in food vinegar on the topic of acid-base titration. The data generated in this study indicates that the natural indicator of jambolan fruit peels can be used as a substitute for synthetic indicators. Its use in learning provides knowledge to students regarding the chemicals that are more economical and environmentally friendly and support implementation of ESD concept in school.