This research was carried out to study the application of butterfly pea or Clitoria ternatea L. flower extracted as an natural acid-base indicator. The properties of water and ethanolic extracted of butterfly pea flower was investigated. It was found that the extracted solution changes the colour at different pH and can be used successfully as a compound indicator. An indicator changes color depending on whether it comes in contact with an acid or base. The extracted solution from a butterfly pea can indicate the following: color change to red (pH 1- 2), purple (pH 3-4), blue (pH 5-8), brown color (pH 9 -11) and the yellow color at pH above 12. The present work highlights the extracted solution of butterfly pea used as an acid-base indicator in different types of acid-base titration such as strong acid-strong base, strong acid-weak base, strong base-weak acid and weak acid-weak base. The indicators were found to be useful in all types of acid-base titrations. The concentrated butterfly pea solution was which kept in the dark at room temperature for 4 weeks, it was found that the stability of extracted indicator solution is still high and good for acid-base titration, the results which were comparative to those of synthetic indicators such as phenolphthalein, methyl red and bromthymol blue. Therefore indicators from butterfly pea was very useful, high potential for acid-base titration and could be replaced for synthetic indicators. Moreover it is non-expensive, simple preparation and friendly for environment.
This research was carried out to study the application of butterfly pea or Clitoria ternatea L. flower extracted as an natural acid-base indicator. The properties of water and ethanolic extracted of butterfly pea flower was investigated. It was found that the extracted solution changes the colour at different pH and can be used successfully as a compound indicator. An indicator changes color depending on whether it comes in contact with an acid or base. The extracted solution from a butterfly pea can indicate the following: color change to red (pH 1- 2), purple (pH 3-4), blue (pH 5-8), brown color (pH 9 -11) and the yellow color at pH above 12. The present work highlights the extracted solution of butterfly pea used as an acid-base indicator in different types of acid-base titration such as strong acid-strong base, strong acid-weak base, strong base-weak acid and weak acid-weak base. The indicators were found to be useful in all types of acid-base titrations. The concentrated butterfly pea solution was which kept in the dark at room temperature for 4 weeks, it was found that the stability of extracted indicator solution is still high and good for acid-base titration, the results which were comparative to those of synthetic indicators such as phenolphthalein, methyl red and bromthymol blue. Therefore indicators from butterfly pea was very useful, high potential for acid-base titration and could be replaced for synthetic indicators. Moreover it is non-expensive, simple preparation and friendly for environment.
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