# Investigating the Movement of Water Within a Selectively Permeable Membrane

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Investigating the Movement of Water within a Selectively Permeable Membrane Introduction In this experiment my teacher gave me the general task to investigate how water molecules move through selectively permeable membranes, to do this I will see how potato borings change during osmosis. To do this I will put the potato borings into different solutions and see what changes. Hypothesis My hypothesis is that when the concentration of the solution is much higher or lower compared to the concentration of the potato the mass of the potato will change the most. If the concentration of the solution isn’t a lot higher or lower than the concentration of the potato then the amount of water molecules that will move will be less causing the mass change to be small, whereas if the concentration of the solution is a lot higher or lower than the concentration of the potato then the mass of the potato will change a lot because more water molecules will move through the selectively permeable membrane and the mass will change. If the concentration of the potato is a lot higher than the concentration of the solution then the potato will be hypertonic compared to the solution and will mean that water will move towards the potato and away from the solution causing a gain in mass in the potato until there is a equilibrium meaning the mass won’t change because the same amount of water is passing in-between the potato and solution. However if the concentration of the potato is a lot lower compared to the concentration of the solution this will mean that the potato is hypotonic and water will move towards the solution and away from the potato causing the potato to lose mass until it reaches an equilibrium where there is the same amount of water passing in-between the solution and potato. Theory When an object that has a selectively permeable membrane is placed into water the water