Question

Filtration is used when the substances to be separated are _________ ( soluble/insoluble) in a liquid.

Answer 1

1. The process of removal of insoluble substances from the solution is called filtration.
2. The substance that remains on the filter paper is called a residue while the one that passes through the filter paper is called a filtrate.

Hence, filtration is used when the substances to be separated are insoluble in a liquid.