Question

the process of separating of insoluble impurities from a liquid? (answer for grade 7)

Answer 1

To separate insoluble impurities from Salt you used a process called filtration. The filter paper allowed the soluble solute which is salt and the solvent which is water to pass through but it trapped the larger pieces of insoluble impurities as a Residue. The substances that pass through the filter paper are called the filtrate.