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Hydrogen
Question
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How do we prepare H2O2 by reaction between BaO2.8H2O and dilute sulphuric acid ?

Answer

By the action of sulphuric acid  on hydrated barium peroxide BaO2.8H2O

BaO2.8H2O + H2SO4 → BaSO4 ↓+ H2O2 + 8H2O
It must be noted that anhydrous barium peroxide does not react readily with sulphuric acid (because a coating of insoluble barium sulphate is formed on its surface which stops the further action of the acid). Therefore, hydrated barium peroxide, BaO2.8H2O must be used.

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