Shikha was having her lunch during break in the school and dropped some curry on her white shirt. After
reaching home she tried to wash that stain with soap and observed that the colour changed instead of disappearing.
What do you think happened and why?
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Explanation:
(a) The natural indicator present in curry stain is turmeric.
(b) The yellow stain of curry turns reddish-brown when soap is scrubbed on it because of the fact that soap solution is basic in nature which changes the colour of turmeric in the curry stain to reddish-brown. This stain turns yellow again when the cloth is rinsed with water because then the basic soap gets removed with water.
(c) The nature of soap is basic.
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