1. Dissolve the mixture in water. Both ammonium chloride and sodium chloride are soluble in water, so they will both dissolve when the mixture is added to water.
2. Add a small amount of sodium hydroxide solution to the mixture. Sodium hydroxide will react with the ammonium chloride to form ammonia gas, which will escape from the mixture.
3. Boil the mixture until all of the ammonia gas has escaped. Continue to boil the mixture until you no longer see any bubbles of gas escaping.
4. Filter the mixture. The sodium chloride will remain in solution, while the ammonium chloride will have been converted to ammonia gas and escaped from the mixture. Filter the mixture to remove any undissolved solids.
5. Evaporate the filtrate. The filtrate contains the sodium chloride. Evaporate the filtrate to remove the water and crystallize the sodium chloride.
The sodium chloride crystals can then be separated from the remaining liquid by filtration or centrifugation.
