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?
(a) The natural indicator present is turmeric.
(b) Soap being basic in nature turns the colour of the turmeric from yellow to reddish-brown. After washing with lots of water, the soap is removed and the turmeric returns to its yellow colour.

(c) Soap is basic in nature.

Question

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?

(a) The natural indicator present is turmeric.

(b) Soap being basic in nature turns the colour of the turmeric from yellow to reddish-brown. After washing with lots of water, the soap is removed and the turmeric returns to its yellow colour.

(c) Soap is basic in nature.

Philoid · Accepted Answer

(a) The natural indicator present is turmeric.

(b) Soap being basic in nature turns the colour of the turmeric from yellow to reddish-brown. After washing with lots of water, the soap is removed and the turmeric returns to its yellow colour.

(c) Soap is basic in nature.