Here's my idea:
1) NH4NO3 + NaOH --> NaNO3 + NH3 + H2O
The Ammonium Nitrate is obtained from an instant cold packs and can be purified by crystallization and filtration. Then it's combined in an aqueous
solution of Sodium Hydroxide and heated until no more Ammonia is produced. Then the solution is carefully evaporated.
2) 2NaNO3 + 2C --> 2NaCO3 + 2N2
The Sodium Nitrate is melted, and red hot charcoal is dropped into the molten salt, producing sodium carbonate and nitrogen gas.
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