Study of Acid-base Indicator Property of Ethanolic Extract of Nerium indicum Flower

Khalid, Khalid Da’u; Idris, Mustapha Balarabe; Muhammad, Naziru Alhassan; Bala, Ahmad

doi:10.9734/bjpr/2016/20556

Cited by 6 publications

(6 citation statements)

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“…Another interesting topic in senior high school chemistry experiment is acid-base indicator. Acid-base indicator can be described as halochromic chemical agents which are added in small amount to a solution to determine the pH (acidity or basicity) of the solution visually and change the color with variation in pH (Khalid et al, 2015;Sharma et al, 2013;Vyas et al, 2012). Acid-base indicator is usually weak base or acid which partly dissociates in water.…”

Section: Acid-base Indicatormentioning

confidence: 99%

The Integration of Green Chemistry Principles into Small Scale Chemistry Practicum for Senior High School Students

Listyarini

Pamenang

Harta

et al. 2019

JPII

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Implementation of Principles of Green Chemistry in teaching chemistry can become an essential approach to enhance students' awareness of environmental problem. In contrast with the goal of sustainability, chemistry practicum normally deals with chemicals and waste management which contribute to environmental problem. A shift toward more sustainable and economical experiments is essential to maintain the existence of the practicum in senior high curriculum. Small Scale Chemistry (SSC) practicum is one of the approaches to promote sustainability in chemistry practicum by using smaller scale and safer apparatus. It is expected to produce less waste. It is also safer and more economical chemistry experiment. This research aims to study the integration of principles of green chemistry in chemistry practicum by using SSC experiment. This study investigates two main topics in senior high school chemistry subject: electrochemistry and acid-base indicator. This study has shown the practice of integration of the principles of green chemistry approach into senior high school chemistry practicum through SSC. The experiments demonstrated in this study enable us to integrate Principles of Green Chemistry in terms of preventing waste, using less hazardous chemical, and conducting safer experiments which can be implemented in senior high school chemistry practicum.

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Section: Acid-base Indicatormentioning

confidence: 99%

The Integration of Green Chemistry Principles into Small Scale Chemistry Practicum for Senior High School Students

Listyarini

Pamenang

Harta

et al. 2019

JPII

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“…In acid-base titrations, acids are titrated with bases, and vice versa. They are also referred to as neutralization reactions, with the equivalent point detected either by use of colour indicators or potentiometrically with a glass electrode [3, 4]. They employ colour indicators to detect endpoints of acid-base neutralization reactions.…”

Section: Introductionmentioning

confidence: 99%

“…Acid-base indicators of natural origin have proven to be better alternatives in titrimetric analysis, as they are readily available, easy to extract, cheaper, less toxic, and environmentally friendly, unlike synthetic colour indicators which are associated with high cost and toxicity to the environment and users [4, 6, 7]. Plumbagin (5-hydroxy-2-methyl-1,4-naphthoquinone) is a natural organic dye found in plants of the families Plumbaginaceae, Droseraceae, Ebenaceae, Iridaceae, Ancistrocladaceae, Drosophyllaceae, and Nepenthaceae [8, 9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Acid-Base Indicator Property of Plumbagin fromPlumbago zeylanicaLinn

Adusei

Adosraku

Kyekyeku

et al. 2019

International Journal of Analytical Chemistry

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There has been an increasing interest in the search for colour indicators of natural origin for titrimetric analysis. This is due to some challenges associated with the currently used synthetic ones. This study evaluates and validates the acid-base indicator property of plumbagin isolated from Plumbago zeylanica Linn. Plumbagin (5-hydroxy-2-methyl-1,4-naphthoquinone) was isolated from the roots of Plumbago zeylanica Linn using silica gel chromatography and characterized using spectroscopic methods in comparison with those reported in the literature. Its acid-base indicator property was evaluated alongside phenolphthalein and methyl orange, after it was found to exhibit a sharp change in colour at various pH ranges. The plumbagin indicator was successfully used to assay ibuprofen powder and tablets (400 mg) using the British Pharmacopoeia (2013) method. Data obtained were analyzed statistically by Student’s t-test and one-way ANOVA in GraphPad Prism (version 5.01, 2010). Analysis of the use of the plumbagin indicator in acid-base titrations between strong acids and strong bases and between weak acids and strong bases has been evaluated and validated according to the ICH guidelines. Plumbagin use in ibuprofen powder and tablets has also been verified. Plumbagin has been validated for use as an indicator suitable for different acid-base titrations and the analysis of ibuprofen.

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“…This indicator is suitable for weak acid-weak base titration 7 . Extracts of Nerium indicum had been effectively used as acid-base indicators that can replace phenolphthalein indicator because its availability is abundant, easily prepared, precise and accurate results 8 . Then, extracts of Aspilia africana with different solvents had also been applied to be acid-base indicators and can replace phenolphthalein indicator 9 .…”

Section: Introductionmentioning

confidence: 99%

Thunbergia erectaL. FLOWER AS AN ALTERNATIVE ACIDBASE NATURAL INDICATORS

Tukiran¹,

Wardana²

2018

RJC

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As known that synthetic acid-base indicators can cause some environmental problems such as chemical pollution, availability problems and high cost. Therefore, many researchers are now trying to find an alternative indicator to substitute the synthetic indicators by optimizing the natural pigment of the plant. Related to this, an attempt to investigate the indicator activity of Thunbergia erecta L. flowers extract as natural indicators had been conducted. Flower pigment of the plant was extracted by maceration using ethanol and 1% HCl. The flower extract showed visible color change at pH from 1 to 14 and its absorbance was measured using a UV-Vis spectrophotometer. The indicator activities of flower extract had been applied in titration using a strong acid-strong base with given concentration. The extract showed an absorption band at 315 and 269 nm. The result showed pH range of indicators presented in at pH from 10 to 11 with 0.382 error percentage. Thus, Thunbergia erecta L. flower can be used as an alternative indicator to be commercial indicators that are more environmentally friendly.

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Study of Acid-base Indicator Property of Ethanolic Extract of Nerium indicum Flower

Cited by 6 publications

References 0 publications

The Integration of Green Chemistry Principles into Small Scale Chemistry Practicum for Senior High School Students

The Integration of Green Chemistry Principles into Small Scale Chemistry Practicum for Senior High School Students

Investigation of Acid-Base Indicator Property of Plumbagin fromPlumbago zeylanicaLinn

Thunbergia erectaL. FLOWER AS AN ALTERNATIVE ACIDBASE NATURAL INDICATORS

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