In a homogeneous mixture, the size of particles of solute is typically:

In a homogeneous mixture, the solute particles are extremely small, typically less than 1 nm in diameter. Because the particles are so small, they cannot be seen even with a high-power microscope, and they do not scatter a beam of light. These particles are uniformly distributed throughout the solvent and do not settle down when left undisturbed, meaning the mixture is highly stable. Due to their tiny size, solute particles in a homogeneous mixture can easily pass through filter paper, making it impossible to separate them by simple filtration.