Arun observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation?
I. Soap is acidic in nature.
II. Soap is basic in nature.
III. Turmeric is a natural indicator which gives reddish tinge in bases.
IV. Turmeric is a natural indicator which gives reddish tinge in acids.

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Solution

Turmeric is a natural indicator. Its colour changes from yellow to red in basic medium.

Soaps are basic in nature. So when a turmeric stain is washed with a soap solution, the stain colour changes to red.

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Turmeric is a natural indicator. Its colour changes from yellow to red in basic medium. Soaps are basic in nature. So when a turmeric stain is washed with a soap solution, the stain colour changes to red.

Turmeric is a natural indicator. Its colour changes from yellow to red in basic medium.

Soaps are basic in nature. So when a turmeric stain is washed with a soap solution, the stain colour changes to red.