A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again. (c)What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?

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Solution

Turmeric contains a yellow dye. It turns red in basic solutions.

Since the yellow stain turns reddish-brown when soap is rubbed on this shirt during washing thus, the nature of soap must be basic.

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Turmeric contains a yellow dye. It turns red in basic solutions. Since the yellow stain turns reddish-brown when soap is rubbed on this shirt during washing thus, the nature of soap must be basic.

Turmeric contains a yellow dye. It turns red in basic solutions.

Since the yellow stain turns reddish-brown when soap is rubbed on this shirt during washing thus, the nature of soap must be basic.