Q. 56

Why can dilute so

Answer :

The dilute solutions of hydrogen peroxide cannot be concentrated by simple heating. This is because hydrogen peroxide readily decomposes below its boiling point.So, to obtain a concentrated solution of hydrogen peroxide, the following steps are needed to done – The diluted solution is carefully heated on a water bath. Doing slow evaporation, helps the release of water molecules and we obtain 50% solution of H2O2.The 50% solution is placed in vacuum desiccator over concentrated sulphuric acid. The dehydrating nature of sulphuric acid absorbs water vapours and we get 90% solution of H2O2. The 90% solution of H2O2 is then subjected to distillation under reduced pressure. Water distils over at 303 – 313 K and we get 99% pure H2O2 solution.


The 99% solution of H2O2 is cooled in a freezing mixture of solid carbon dioxide and ether. As a result, crystals of hydrogen peroxide separate out which are removed. This gives completely pure hydrogen peroxide.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses