Osmosis

Introduction:
Osmosis is a net diffusion of water between two solutions that differ in solute concentration and that are separated by a selectively permeable membrane.
Hypertonic solution – higher solute concentration outside the cell.
Hypotonic solution – lower solute concentration outside the cell.
Isotonic solution have the same solute concentration outside and inside the cell.

Hypothesis:
Potato cells in 0% solution of salt will swell up. Potato will gain weight, because net movement of water will be into the cells. Water moves down the concentration gradient.
Potato cells in 2% and 3% solutions will shrink. Water moves out of the cells to regions of greater solute concentration.
Potato cells in 1% solution will change little in cell size or shape. The difference between solution concentration and potato concentration is small. So there is no big movement of water.…