Question

student - response activity
1 explain how you would separate a mixture of salt and sand.

Explanation:

To separate a mixture of salt and sand, we can use the following steps:

1. Add Water: First, add water to the mixture. Salt (\(NaCl\)) is soluble in water, while sand (mostly \(SiO_2\)) is insoluble. This dissolves the salt, forming a salt - water solution, and the sand remains as a solid.
2. Filtration: Pass the mixture (the salt - water solution with undissolved sand) through a filter paper in a funnel set over a beaker. The filter paper will retain the sand (the residue), and the salt - water solution (the filtrate) will pass through into the beaker.
3. Evaporation: Take the beaker containing the salt - water solution and heat it (for example, using a Bunsen burner or a hot plate). As the water evaporates, the salt will be left behind as a solid residue in the beaker.

Answer:

To separate a mixture of salt and sand, follow these steps: 1. Add water to the mixture to dissolve the salt (sand is insoluble). 2. Filter the mixture to separate the sand (residue) from the salt - water solution (filtrate). 3. Evaporate the water from the salt - water solution to obtain the salt.