Final answer:
Osmosis is the process where water moves from a 0.1 M (hypotonic) solution to a 0.15 M (hypertonic) solution across a semipermeable membrane until the concentrations equalize.
Step-by-step explanation:
When water diffuses from a 0.1 M solution to a 0.15 M solution, osmosis occurs. This is because osmosis is the diffusion of water across a semipermeable membrane from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration). In this case, water moves from the 0.1 M (hypotonic) solution to the 0.15 M (hypertonic) solution. The process continues until the concentrations equalize, meaning that the water concentration on both sides of the membrane is equal, thereby minimizing the concentration gradient.