Question

Is it possible to concentrate a dilute solution of $H_{2}O_{2}$ by strong heating? Explain.

Answer 1

A dilute solution of Hydrogen peroxide cannot be converted to concentrated solution by heating. Hydrogen peroxide decomposes below its boiling point on heating.

                         $2H_2 O_2\rightarrow2H_2 O+O_2$

By the method of Vacuum distillation, 1% of $H_2 O_2$ is extracted with water and is concentrated to 30 percent by mass.

Under the low pressure, it can be concentrated up to 80% by careful distillation and the remained water may be frozen out to get pure water.