European Journal of Chemistry 2013, 4(1), 20-24 | doi: https://doi.org/10.5155/eurjchem.4.1.20-24.620 | Get rights and content






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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.

4_1_20_24

Keywords


Indicator; Methyl orange; Phenolphthalein; Corolla of Roselle; Acid-base titration; Hibiscus sabdariffa L.

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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

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[1]. 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
DOI: 10.5155/eurjchem.5.1.1-5.901
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[2]. 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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How to cite


Nuryanti, S.; Matsjeh, S.; Anwar, C.; Raharjo, T.; Hamzah, B. Eur. J. Chem. 2013, 4(1), 20-24. doi:10.5155/eurjchem.4.1.20-24.620
Nuryanti, S.; Matsjeh, S.; Anwar, C.; Raharjo, T.; Hamzah, B. Corolla of Roselle (Hibiscus sabdariffa L.) as acid-base indicator. Eur. J. Chem. 2013, 4(1), 20-24. doi:10.5155/eurjchem.4.1.20-24.620
Nuryanti, S., Matsjeh, S., Anwar, C., Raharjo, T., & Hamzah, B. (2013). Corolla of Roselle (Hibiscus sabdariffa L.) as acid-base indicator. European Journal of Chemistry, 4(1), 20-24. doi:10.5155/eurjchem.4.1.20-24.620
Nuryanti, Siti, Sabirin Matsjeh, Chairil Anwar, Tri Joko Raharjo, & Baharuddin Hamzah. "Corolla of Roselle (Hibiscus sabdariffa L.) as acid-base indicator." European Journal of Chemistry [Online], 4.1 (2013): 20-24. Web. 19 Sep. 2020
Nuryanti, Siti, Matsjeh, Sabirin, Anwar, Chairil, Raharjo, Tri, AND Hamzah, Baharuddin. "Corolla of Roselle (Hibiscus sabdariffa L.) as acid-base indicator" European Journal of Chemistry [Online], Volume 4 Number 1 (31 March 2013)

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DOI Link: https://doi.org/10.5155/eurjchem.4.1.20-24.620

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