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.
(c) What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?

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Solution

(a) The curry contains turmeric which works as a natural indicator.

(b) When the shirt with a yellow stain of curry is washed with soap, the stain turns reddish brown because soap is basic and turmeric gives a reddish-brown colour when reacts with a base. When rinsed with plenty of water, the reddish-brown stain turns yellow again due to removal soap.

(c) Soap is basic in nature because it turns the yellow turmeric stain reddish brown.

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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?

The reddish brown stains when clothes are washed with hard water is due to :

Q. On washing with soap, a turmeric stain on the cloth turns to red because
A. soap solution is alkaline.
B. soap solution is acidic.
C. turmeric contains a natural indicator.
D. turmeric contain litmus.
Select the correct alternative.

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