Question

curry stains turn reddish brown when wasted with soap :why?​

Answer 1

Answer:

Curry contains turmeric powder and soap is basic in nature. Bases turn turmeric red. Hence, when soap (which is basic in nature) is scrubbed on the stain, the stain turns red. When the cloth is washed with plenty of water, the soap is removed and the yellow colour of the stain reappears.

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Answer 2

Answer:

The curry might contain turmeric powder which is an indicator of acids and bases. 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.