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Osmosis can be defined as the movement of solvent molecules across a semi-permeable
membrane. These solvent molecules move from areas of higher solvent concentration to areas of
lower solvent concentration. For example, when a potato slice is placed in a hypotonic solution,
the mass of the slice increases. This observation suggests that there was a significant movement
of solvent molecules into the potato slice. The potato contains a high concentration of starch
which causes the solvent molecules move across the semi-permeable membrane into the potato
slice. Consequently, the potato slice becomes turgid and tough.
Alternatively, a potato slice can be placed in a hypertonic solution. The hypertonic
solution has a higher solute concentrat...