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Corolla of Roselle (Hibiscus sabdariffa L.) as acid-base indicator
Siti Nuryanti (1)
, Sabirin Matsjeh (2) , Chairil Anwar (3) , Tri Joko Raharjo (4) , Baharuddin Hamzah (5,*) (1) Department of Chemistry, Faculty of Teacher Training and Education, Tadulako University, Palu, 94118, Indonesia
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, 55185, Indonesia
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, 55185, Indonesia
(4) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Yogyakarta, 55185, Indonesia
(5) Department of Chemistry, Faculty of Teacher Training and Education, Tadulako University, Palu, 94118, Indonesia
(*) Corresponding Author
Received: 22 Apr 2012 | Accepted: 15 Aug 2012 | Published: 31 Mar 2013 | Issue Date: March 2013
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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European Journal of Chemistry
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DOI: 10.5155/eurjchem.4.1.20-24.620
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General Directorate of Higher Education, Ministry of National Education Republic of Indonesia
Citations
[1]. Dibyendu Bikash Datta, Debasish Das, Biswajit Sarkar, Anindya Majumdar
Lantana camara flowers as a natural dye source for cotton fabrics
Journal of Natural Fibers 20(1), , 2023
DOI: 10.1080/15440478.2022.2159604
[2]. Judith Amador-Hernandez, Alberto Rojas-Hernandez, Edith Madai Colunga-Urbina, Iliana Margarita De La Garza-Rodriguez, Miguel Velazquez-Manzanares, Luis Felipe Medina-Vallejo
New chemometric strategies in the spectrophotometric determination of pKa
European Journal of Chemistry 5(1), 1, 2014
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[3]. R. F. Pagariya
GREEN CHEMISTRY: ROSELLE’S COROLLA EXTRACT AS A SUBSTITUTE FOR HAZARDOUS INTERNAL INDICATORS IN VOLUMETRIC ANALYSIS
International Journal of Research -GRANTHAALAYAH 7(9), 118, 2019
DOI: 10.29121/granthaalayah.v7.i9.2019.567
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DOI Link: https://doi.org/10.5155/eurjchem.4.1.20-24.620
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