European Journal of Chemistry

Corolla of Roselle (Hibiscus sabdariffa L.) as acid-base indicator

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Published: Mar 31, 2013
DOI: https://doi.org/10.5155/eurjchem.4.1.20-24.620
Keywords:
Indicator, Methyl orange, Phenolphthalein, Corolla of Roselle, Acid-base titration, Hibiscus sabdariffa L.
Section
Research Article
Issue
Vol. 4 No. 1 (2013): March 2013
Dates
Received 2012-04-22
Accepted 2012-08-15
Published 2013-03-31


Main Article Content

Siti Nuryanti
Department of Chemistry, Faculty of Teacher Training and Education, Tadulako University, Palu, 94118, Indonesia
Sabirin Matsjeh
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, 55185, Indonesia
Chairil Anwar
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, 55185, Indonesia
Tri Joko Raharjo
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, 55185, Indonesia
Baharuddin Hamzah
Department of Chemistry, Faculty of Teacher Training and Education, Tadulako University, Palu, 94118, Indonesia

Abstract

Acid-base titration requires indicators to show color change at each pH interval. Synthetic indicators applied recently have some negatives, such as chemical pollution, availability and expensive production cost. Effort to obtain natural product-based-indicator from corolla of Roselle (Hibiscus sabdariffa L.) has been conducted. Firstly, anthocyanin contained in the Roselle’s corolla was identified. Then, the indicator was obtained by extracting the corolla consecutively with n-hexane, ethyl acetate and methanol-HCl 0.5%. Then the filtrate was evaporated at 65 oC. The obtained indicator was applied in weak base-strong acid and weak acid-strong base titrations. The comparison indicators used in this research were methyl orange and phenolphthalein. The results showed that the Roselle’s corolla indicator gave red color in acidic solution, while green in basic solution. Additionally, its performance is similar to that of methyl orange.

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How to Cite
(1)
Nuryanti, S.; Matsjeh, S.; Anwar, C.; Raharjo, T. J.; Hamzah, B. Corolla of Roselle (Hibiscus Sabdariffa L.) As Acid-Base Indicator. Eur. J. Chem. 2013, 4, 20-24.

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