In the Merck's process for the laboratory preparation of Hydrogen Peroxide (), dilute Sulphuric Acid — Hydrogen Chemistry Question
Question
In the Merck's process for the laboratory preparation of Hydrogen Peroxide ($H_2O_2$), dilute Sulphuric Acid is reacted with Barium Peroxide. Why is it absolutely critical to use hydrated Barium Peroxide ($BaO_2 \cdot 8H_2O$) rather than the anhydrous form ($BaO_2$)?
Answer: C
💡 Solution & Explanation
During the reaction, insoluble Barium Sulphate ($BaSO_4$) is precipitated. If anhydrous $BaO_2$ is used, this precipitate forms a rigid, impermeable crust over the solid, preventing further acid attack and stopping the reaction. Hydrated $BaO_2 \cdot 8H_2O$ prevents this passivation layer from adhering tightly.
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