Concentration of H2O2 : Dilute H2O2 is concentrated to about 50% by slow evaporation on a water bath. It is further concentrated to 90% in a vacuum desiccator using conc.H2SO4 as dehydrating agent. Further concentration to 99% is obtained by distillation under reduced pressure. Last traces of moisture in 99% of H2O2 are removed or anhydrous H2O2 is obtained by cooling it to 263 K in a cold bath of ether and dry ice followed by seeding with a few crystals of solid H2O2 when needle-shaped crystals of 100% H2O2 separate out. The crystals obtained are removed, dried and melted to get 100% H2O2.
Storage of H2O2 : H2O2 is not stored in glass bottles since the alkali metal oxides present in glass catalyse its decomposition. It is, thus, stored in paraffin wax plastic coated glass, or teflon bottles. The small amount of acid, glycerol, alcohol, acetanilide and H3PO4 are often used as stablizers to check its decomposition.
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