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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 ?


Solution

a) Turmeric, the natural indicator present in curry stain.

b) When turmeric is combined with any base liquid like it turns red in colour , when turmeric comes in contact with any substance like that of vinegar, which is acidic in nature, it turns yellow.

c) The nature of soap is basic 


 

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