How to prepare sodium peroxide from sodium chloride?
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The octahydrate is produced by treating sodium hydroxide with hydrogen peroxide. Sodium peroxide can be prepared on a large scale by the reaction of metallic sodium with oxygen at 130–200 °C, a process that generates sodium oxide, which in a separate stage absorbs oxygen: 4 Na + O2 → 2 Na2O.
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The sodium amalgam thus obtained is treated with water to form sodium hydroxide and Hydrogen gas. (iii)Sodium peroxide:It is obtained by heating sodium metal (which is obtained by the electrolysis of molten NaCl), in excess of air. The intially formed sodium oxide reacts with more O2 to form Na2O2.
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