How acid base indicator is extracted from tomato
Answers
Answer:
The extraction process to get the natural colorant as acid-base indicator can be done by maceration technique. As an example, extracted the natural colorant from red cabbage by heating the cabbage in 100oC of distilled water for 24 h. Its color was bluish purple with 3.4-6.0 of pH stretch [3]
Answer:
To prepare a natural indictor:
Select a suitable coloured plant material, such as purple cabbage.
Extract the colour from the plant material by either:
Boiling it in water.
Crushing it with water or alcohol using a mortar and pestle.
Decant the solution from the solid.
To test a natural indicator:
Dip the ends of two strips of filter paper into the indicator and allow to dry.
Using an eyedropper, apply a drop of strong acid to one strip and a drop of strong base to the other strip.
Record any changes in colour.
Add additional drops of acid and base to the strips until no further changes in colour are observed.
If an indicator is prepared from purple cabbage, the following colours should be observed:
Initial/Neutral colour: Purple
Colour when exposed to strong acid: Pink, then Red
Colour when exposed to strong base: Blue-Green, then Yellow
Purple cabbage
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