A white shirt has a yellow stain of curry. When a soap is rubbed on the shirt to clean it, the yellow stain turns reddish-brown. On rinsing, the reddish-brown stain turns back to yellow. What is the natural indicator used here?

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Solution

Turmeric is the natural indicator used here which is present in the curry stain.

The yellow stain of curry turns reddish-brown when soap is rubbed on it because soap solution is basic in nature that changes the colour of turmeric in the curry stain to reddish-brown. This stain turns yellow again when the cloth is rinsed with water.

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A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish - brown. On rinsing the shirt with plenty of water, the reddish - brown stain turns yellow again.

(a) Name the natural indicator present in curry stain.

(b) Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.

A white shirt has a yellow stain of curry. When a soap is rubbed on the shirt to clean it, the yellow stain turns reddish-brown. On rinsing, the reddish-brown stain turns back to yellow. Name the natural indicator present in the curry stain.

A yellow stain of curry on a white clothe turns reddish-brown when it comes in contact with soap. Why does this happen?

Q. A yellow curry stain on a white shirt turns red when it is washed with soap. Explain why?

Q. 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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A white shirt has a yellow stain of curry. When a soap is rubbed on the shirt to clean it, the yellow stain turns reddish-brown. On rinsing, the reddish-brown stain turns back to yellow.​​ What is the natural indicator used here?

A white shirt has a yellow stain of curry. When a soap is rubbed on the shirt to clean it, the yellow stain turns reddish-brown. On rinsing, the reddish-brown stain turns back to yellow. What is the natural indicator used here?