Prove that sodium hydroxide solution, when stored in an open jar, is partially converted to sodium carbonate.

Sodium hydroxide is a caustic alkali and can interact with acidic oxides, in particular with carbon dioxide. The atmospheric air contains an average of 0.04% carbon dioxide. When storing sodium hydroxide in an open container, the reaction will proceed:
2NaOH + CO2 = Na2CO3 + H2O



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