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Give one method of preparation of H2O2 ....

Give one method of preparation of `H_2O_2` .

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A dilute solution of sulphuric acid is taken in a container. It is surrounded by ice. Small amount of sodium peroxide is added to it with constant shaking. On cooling of this solution, crystals of `Na_2SO_4 . 10H_2O` are formed. These crystals are separated out by filtration. Filtrate contains hydrogen peroxide. This process is known as Merck.s process.
`Na_2O_2 + H_2SO_4 to Na_2SO_4 + H_2O_2`
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