Question

Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of What might be the reason for his observation? i. Soap is acidic in nature ii. Soap is basic in nature iii. Turmeric is a natural indicator which gives reddish tinge in bases iv. Turmeric is a natural indicator which gives reddish tinge in acids A. i and ii B. ji and i C. i and iv D. i and iv​

Answer 1

Answer:

So, when soap is scrubbed over a stain, the turmeric present in the curry reacts with the sodium hydroxide present in the soap and this reaction develops a reddish brown color. Here turmeric acts as an indicator. Indicator is something which changes its color upon changing the concentration i.e. acidic or basic. When the same cloth is washed with plenty of water, it turns yellow because the sodium hydroxide is diluted upon addition of water and the reaction stops turning it back into yellow.. In the labs, litmus paper, phenolphthalein etc are used as indicators whereas some naturally occurring indicators are turmeric, rose petals, grape juice etc.

Explanation:

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