Chemistry
Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3. Explain why?
Nitric Acid
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Answer
An aqueous solution of nitric acid (68% concentration) forms a constant boiling mixture at 121°C. A constant boiling mixture is one which boils without change in composition.
Hence on boiling further, the mixture evolves out the vapours of both acid and water in the same proportion as in the liquid.
Therefore, dilute HNO3 cannot be concentrated beyond 68% by boiling.
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