Final answer:
Particles dissolved in a solution will pass through a filter, as dissolved solute particles are too small (<1 nm) to be caught by the filter. Filtration separates heterogeneous mixtures, not substances in true solution. Distilled distillation may be required to separate solute from solvent in a solution.
Step-by-step explanation:
Any particles that are dissolved in solution will pass through any filter. This is because when a substance like sugar is dissolved into water to form a true solution, the mixture is stable and homogeneous, and the particles are very small - typically less than 1 nm in diameter. In the case of a solution, the solute particles, which could be atoms, ions, or molecules, do not separate by simple filtration.
Filtration can remove undissolved particles from a heterogeneous mixture, such as sand in water, leaving behind the solid particles on the filter. However, dissolved substances, like NaCl in water, cannot be separated this way. Dissolved solute particles are uniformly distributed throughout the solvent and can only be separated by physical processes that do not use filtration, such as distillation.