1. Add a suitable solvent, such as water, to both ammonium chloride and sodium chloride.

2. Stir or heat the mixture to dissolve both salts completely.

Step 2: Fractional Crystallization

1. Take the aqueous mixture obtained in Step 1 and start heating it gently.

2. As the temperature increases, the solubility of both salts will increase. However, the solubility of ammonium chloride increases at a faster rate compared to sodium chloride.

3. Continue heating the solution until you reach a temperature where sodium chloride starts to crystallize while ammonium chloride remains dissolved.

Step 3: Filtration

1. Now, filter the hot solution to separate the crystallized sodium chloride (NaCl) from the remaining solution containing ammonium chloride.

2. The sodium chloride crystals will be retained on the filter paper, while the ammonium chloride solution will pass through as filtrate.

Step 4: Concentration and Cooling

1. Collect the filtrate obtained in Step 3, which contains ammonium chloride.

2. Concentrate the filtrate by heating it gently to evaporate some of the water content.

3. As you continue heating, the solubility of ammonium chloride will decrease, and it will start to crystallize.

4. Remove the concentrated solution from heat and allow it to cool slowly at room temperature.

Step 5: Final Filtration and Drying

1. Once the solution has cooled, filter it again to separate the crystallized ammonium chloride crystals.

2. Wash the crystals with a small amount of cold water to remove any remaining impurities.

3. Transfer the ammonium chloride crystals to a drying dish or tray.

4. Place the dish in a warm, dry place or use a gentle heat source to dry the crystals completely.

By following these steps, you will be able to successfully separate ammonium chloride from sodium chloride through the process of fractional crystallization.