Question

What will happen if youtry to wash curry stains on your shirt with a soap?[ hint: the curry contains turmeric]

Answer 1

Soap is a base. When it reacts with turmeric,an indicator it turns red. So the curry stains turn red

Answer 2

 if we try to wash curry stains on your shirt with a soap , the stain will turn red

as turmeric is an natural indicator , it will be red in basic medium and when we try to wash of the red stain with water the red colour will be gone 
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Turmeric is an natural indicator and using it we can understand weather the given solution is acid or base but we cannot check the strength of the solution