During Diffusion, How Do the Solute Molecules Move

Question

During diffusion, how do the solute molecules move?
A) up a concentration gradient of solute molecules
B) down a concentration gradient of solvent molecules
C) down a concentration gradient of solute molecules
D) unpredictably with regards to a concentration gradient of solvent molecules

Accepted Answer

During diffusion, solute molecules move down a concentration gradient of solute molecules, from an area of high concentration to an area of low concentration. This is because solute molecules are more likely to move and spread out in areas where there are fewer solute molecules present.