Question

using a labelled diagram, describe how a dry sample of oxygen can be prepared from sodium peroxide.

Answer 1

Water decomposes sodium peroxide with the formation of sodium hydroxide and oxygen. If water in a dropping-funnel is allowed to fall, drop by drop, on 5 g of dry sodium peroxide in a dry 100 ml Erlenmeyer flask fitted with a delivery-tube, a steady evolution of pure oxygen is secured.