Chemistry
State why nitric acid
(i) stains the skin
(ii) cannot be concentrated beyond 68% by boiling.
Nitric Acid
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Answer
(i) Nitric acid brings about nitration of protein of the skin forming a yellow compound Xanthoproteic acid which stains the skin yellow.
(ii) A constant boiling mixture is maintained at 121°C, it is when the mixture boils without change in composition. Hence, on boiling, the above mixture evolves out the vapours of both acid and water in the same proportion as in the liquid. Thus, nitric acid cannot be concentrated beyond 68% by boiling.
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