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If turmeric does not change colour in neutral and acid so how will we know if the solution is neutral or acidic in nature?
Turmeric is a common spice in curry. It is a natural indicator and is used to check acidity and basicity. Turmeric is yellow in acid and neutral substances but turns bright red with bases.
In order to check if the solutions are Acidic, Basic or Neutral in nature, by Turmeric Indicator following steps must be followed:
1. Place a drop of each liquid on turmeric indicator. The solution which changes the colour of the indicator to red is basic in nature.
For example, sodium hydroxide (NaOH).
2. Add a drop of this Basic solution,(sodium hydroxide) on the other two liquids taken separately to obtain two mixtures.It will form a basic mixture with the Neutral solution (Example: sugar solution) and salt with the Acidic solution.
3. Add a drop of each mixture on turmeric indicator. The mixture that changes its colour of indicator red contains Neutral sugar solution(as it is now basic in nature).
While the mixture which does not show any colour change in indicator contains Acidic Solution(Example: hydrochloric acid) which was neutralised on the addition of sodium hydroxide.
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