* Filtration works by separating components based on particle size. The filter paper or membrane traps larger particles while allowing the smaller particles (like the solvent) to pass through.

* Insoluble solutes are those that don't dissolve in the solvent. They form separate, visible particles that are typically larger than the solvent molecules.

Examples of mixtures you can filter to remove the solute:

* Sand and water: Sand is insoluble in water and forms larger particles that can be easily trapped by a filter.

* Chalk and water: Chalk is insoluble in water and will settle to the bottom, making it easier to separate by filtration.

* Coffee grounds and water: Coffee grounds are insoluble in water. Filtering produces brewed coffee.

* A mixture of iron filings and water: Iron filings are insoluble in water and can be separated with a filter.

Important Note: For mixtures where the solute is soluble (like sugar dissolved in water), filtration won't work. The solute particles are too small to be trapped by the filter paper. You'll need different techniques like evaporation or distillation to separate those mixtures.