Question

kamal s white shirt was stained with lentins . when he started washing with soap . the stain turned red because the soap is .........../​

Answer 1

Explanation:

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CHEMISTRY

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.

(a) Name the natural indicator present in curry stain.

(b) Explain the changes in colour of this indicator which take place during washing and rinsing the shirt.

(c) What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain? 

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ANSWER

(a) The natural indicator present in curry stain is turmeric.

(b) The yellow stain of curry turns reddish-brown when soap is scrubbed on it because of the fact that soap solution is basic in nature which changes the colour of turmeric in the curry stain to reddish-brown. This stain turns yellow again when the cloth is rinsed with water because then the basic soap gets removed with water.

(c) The nature of soap is basic.

Answer 2

Answer:

Hi friend, we know that turmeric is an indicator which changes its yellow colour into reddish brown when come in contact with solution of base.We know that soap solution is base and thus , when turmeric stain is washed with soap a base turns reddish brown.