The substance moved into the water through osmosis. The
concentration of the substances inside the dialysis bag was higher
than in the water and membrane was permeable to the substances. As
such, they moved from a high to a low concentration along a
In this scenario, the concentration of solutes (the glucose and
starch) is higher inside of the dialysis tubing than it is outside.
As such, water will diffuse (via osmosis) into the dialysis tubing
causing it to swell.