Describe how the student can obtain pure dry crystals of salt from the salt solution.

Sure, here are the steps to obtain pure dry crystals of salt from a salt solution:

1. Evaporation: Heat the salt solution in an evaporating dish. This will cause the water in the solution to evaporate, leaving behind the salt.

2. Crystallization: As the solution cools, salt crystals will start to form. This process can be sped up by scratching the inside of the dish with a glass rod.

3. Separation: Once the crystals have formed, they can be separated from the remaining solution by filtration. This involves pouring the mixture through a filter paper in a funnel, which will allow the liquid to pass through but will trap the solid crystals.

4. Drying: The crystals can then be dried by placing them on a piece of filter paper and leaving them in a warm place for a few hours. Alternatively, they can be dried in a desiccator, which is a sealed container that contains a substance that absorbs moisture.

5. Purification: If necessary, the crystals can be purified by recrystallization. This involves dissolving the crystals in a minimum amount of hot water and then allowing the solution to cool so the crystals reform. Impurities will remain dissolved in the water, while the pure salt crystals will reform.

6. Collection: The pure, dry salt crystals can then be collected and stored.