Potential of Andong Leaf Extract (Cordyline fruticosa (L) A. Chev) as an Indicator for Acidimetric Titration

Abstract

Andong leaves have a red pigment that comes from flavonoid compounds, namely anthocyanin, which can be used as a natural dye. Anthocyanin pigments are secondary metabolites and are polar pigments that are naturally soluble in water so they have the ability to react both with acids and bases. Anthocyanin pigments will change to red if they are in an acidic environment and will turn green or yellow if they are in an alkaline environment. The characteristic color change of this anthocyanin pigment is the potential of andong leaf extract as a natural indicator in determining the end point in acidimetric titration. This study aims to determine whether there is a difference in the concentration of HCl titrated with the indicator methyl orange (MO) and andong leaf extract. The research design used was quasi-experimental with a purposive sampling technique. The sample is andong leaf extract with a concentration of 60%. Then the sample was applied as an acidimetric titration indicator for 32 titrations. Based on the results of acidimetric titration, the average HCl concentration value using the MO indicator was 0.0953 N and the average HCl concentration value using andong leaf extract was 0.0937 N. Based on the results of the Mann-Whitney test, a significance value of 0.000 (<0.05) was obtained, which means that there was a difference in the concentration of HCl titrated with the indicator MO and 60% andong leaf extract