Greening the Chemistry Laboratory: Use of Flower Extracts as Substitutes for Synthetic Acid-Base Indicators

The search for natural compounds as acid-base indicators has continued due to environmental friendliness, availability and cost. Some highly coloured pigments extracted from plants create colour changes with varying pH values. This research was conducted to analyse the indicator properties of Acanthus sennii chiovenda flower ethanol and acidified ethanol extracts and compare the findings with those of existing synthetic indicators (phenolphthalein, bromothymol blue and methyl red). With an ultraviolet-visible spectrophotometer and a phytochemical screening examination, flower extracts of the plant were characterised. The colour shift in terms of varying pH was also investigated by applying four drops of the plant’s flower extracts to the definite volume of solutions at different pH levels. Four forms of acid-base titration were applied to the flower extracts of the plant in the titrimetric analysis. The existence of anthocyanins and flavonoids in ethanol and acidified ethanol was verified by phytochemical analysis and spectral studies of Acanthus sennii chiovenda flower extracts responsible for the precise and sharp colour change at the end point. The findings showed that this plant’s flower extracts could be used as acid-base indicators. Statistical analyses and comparisons with the effects of the synthetic metrics are carried out.

Author (s) Details

Habitamu Baye
Department of Chemistry, Debre markos University, Ethiopia.

Sintayehu Leshe
Department of Chemistry, Debre markos University, Ethiopia.

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