Synthesis of Sodium peroxide

Start heating sodium metal in a ceramic crucible until it ignites, start a slow stream of oxygen and place lid on top of the crucible. Care must be taken care to not overheat the mixture, sodium peroxide will decompose if heated above 600°C. When the burning stops cool the product down and seal in an airtight container.

4Na + O2 = 2Na2O
2Na2O + O2 = 2Na2O2

Source

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Molten sodium

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The sodium ignited, start slow oxygen flow

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Addition of oxygen with lid on the reaction should look like this

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When the peroxide mixture is still hot some gray oxides are present

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After cooling down there is crude sodium peroxide in the beaker

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