Why does a yellow curry stain on a white shirt turn red when it is washed with soap?

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Solution

A yellow curry stain turns red when washed with soap because soap is basic in nature and turmeric found in curry is a natural indicator that turns red when treated with the base. Since soaps are basic in nature, they convert the yellow colour of turmeric to red.

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Similar questions

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.

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

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.

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