First slide

Hydrogen Peroxide

Question

For obtaining 100% pure H₂O₂, the last traces of water are removed by

Moderate

A

distillation
B

heating on water both
C

distillation under reduced pressure
D

sudden cooling in freezing mixture of ether/solid CO₂

Solution

90% solution is cooled with solid CO₂+ ether bath. Cooling is continued till crystallization sets in. Crystals are separated, melted and refrozen for further concentration.

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