Extraction of Jambolan Fruit Peels (Syzygium Cumini L.Skeels) as Substitute for Synthetic Acid Base Indicators Implementation of the ESD Concept
Mian Maria Stephanie (a), Moersilah (a), Maria Paristiowati (a)*
a) Departemen of Chemistry Education, FMIPA, University State of Jakarta
Jl. Rawamangun Muka, Jakarta Timur, 13220, Indonesia
*maria.paristiowati[at]unj.ac.id
Abstract
The use of renewable material with safe solvents to extract natural indicator of 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. The results of maceration then extracted in two different solvents (n-hexane and chloroform). Testing extract using various pH solutions showed indicator of jambolan fruit peels showing discoloration red at pH 1-2, fades from pH 3-7, purple at pH 8, green pH 9-11 and yellow at pH 12-14. Testing with the titration method shows that the volume of the titration endpoint using natural indicator is not much different from the PP and MM indicator. The data generated in this study indicates that extract of jambolan fruit peels can be used as a substitute for synthetic indicators as the implementation of ESD concept at school.
Keywords: Jambolan fruit, acid-base indicator, education for sustainable development
Topic: Chemistry Education