Osmosis and Weight Change: Dialysis Tube Experiment Explained

After 30 minutes, the weight of the dialysis tube will increase. This is because water from the inside of the tube will move out to the salt solution due to osmosis. Osmosis is the movement of water molecules from an area of low solute concentration to an area of high solute concentration. In this case, the salt solution has a higher solute concentration than the water inside the tube, so water will move out of the tube to equalize the concentrations.