. Why can dilute solutions of hydrogen peroxide not be concentrated by heating. How can a concentrated solution of hydrogen peroxide be obtained

Best Answer

Answer: H2O2 solution cannot be concentrated by heating beyond 30% solution as there is always possibility of explosions. The solution is concentrated at 35 – 40° C under reduced pressure of about 15 mm. Repeated distillation gives 90% H2O2. Further concentration is achieved by cooling with the help of solid CO2 and ether bath till crystallisation sets in. Crystals are separated, melted and refrozen to get 99% pure H2O2.

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