... the percentage change gets lower the more concentrated the salt solution is. This is because the potato absorbed the water due to Osmosis and therefore gained weight. But if the solution contains sodium chloride the water potential of the potato is more negative then the water potential of the potato therefore water is drawn out of the potato and in to the solution caused by Osmosis. This is what caused the potato to lose or gain weight. It can be seen from looking at the results that the perfect concentration for the potato to be placed in without gaining or loosing any water is somewhere between 0 and 0.2 mol/dm?³. Using the graph I can predict that it will be 0.1 as this is where the line crosses the Y-axis (I've put a ring around this area to indicate it more clearly). Once the line on the graph reached 1.0, the ...

See this essay or coursework document in full right now