Question

how does the spot of turmeric on the cloth change its colour, when we try to wash it with soap?​

Answer 1

Answer:

because soap contains sodium hydroxide which is basic in nature so tumeric colour changes to red when mixed with the base as it is a natural acid base indicator

Answer 2

Answer:

turmeric is a visuale indicator of acids and bases.soap is a base which reacts with yellow turmeric and turns into red.