INTEGRITY JOURNAL OF EDUCATION AND TRAINING
Integrity Research Journals
ISSN: 2636-5995
Model: Open Access/Peer Reviewed
DOI: 10.31248/IJET
Start Year: 2016
Email: ijet@integrityresjournals.org
The use of plant extracts as indicators in teaching acid-base titrations: Case of Hibiscus sabdariffa (Zobo), Beta vulgaris (Beet root), Hibiscus rosa sinensis and Acalypha wilkesiana
https://doi.org/10.31248/IJET2020.087 | Article Number: FE38A8641 | Vol.4 (4) - December 2020
Received Date: 07 September 2020 | Accepted Date: 14 October 2020 | Published Date: 30 December 2020
Authors: Ayodele Olufunmilayo D*. , Olabode Hawa O. and Bolarinwa Tawakalitu
Keywords: Acid-base titration, plant indicators, synthetic indicators, H. sabdariffa, H. rosa sinensis, A. wilkesiana, Beta vulgaris L.
Acid-base titrations are the main part of volumetric analysis in the secondary school chemistry practical syllabus in Nigeria. Synthetic indicators are generally used in teaching students the procedure and skills required in acid-base titrations. However, some of these synthetic indicators are not readily available, some are toxic and there is a special procedure to be followed in preparing them for use as indicators. Hence there is need to consider the suitability of natural indicators which are more readily available, easy to prepare and ecofriendly compared. Therefore, this study aimed at investigating the suitability of Hibiscuss rosa sinensis, Acalipha wilkesiana, Hibiscus sabdariffa and Beta vulgaris L. extract as indicators in acid-base titration. The results showed that in strong-acid strong-base titration, all the plant extracts under study are suitable. All the plant extracts are fairly suitable for strong-acid and weak-base, except Beta vulgaris L. which is unsuitable for this titration. H. rosa sinensis is most suitable for weak-acid weak-base titrations similar to phenolphthalein, Acalipha wilkesiana is fairly suitable while H. sabdariffa and Beta vulgaris L. are unsuitable. For weak-acid strong-base titrations, all the plant extracts are fairly suitable especially H. sabdariffa. It was recommended that the use of these flower extracts as acid-base indicators should be incorporated in the teaching of acid-base titration especially in the secondary schools.
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