Question

why does a vegetable stain turn reddish brown when washed with soap solution?

Answer 1

Turmeric is a pH indicator and displays different colours in acidic, neutral and basic solutions. It is yellow in colour in acidic and neutral medium and changes to a red brown colour at basic pH. Soap is basic and in presence of soap turmeric is reddish brown and on washing off the soap with water the medium is neutral again.

Answer 2

Answer:

Becoz turmeric is an indicator which gives red colour with a base since soap is a base so we get red colour

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