Osmosis is defined as the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration.
In a high concentration of water the amount of solute (e.g. sugar) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute (e.g. sucrose) is high. This could be called a strong or concentrated solution. When two such solutions are divided by a semi-permeable membrane the water will move from the area of high concentration to the area of low concentration, until both sides are equal (have reached equilibrium).
Knowing that osmosis will occur across a semi-permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane, and knowing that when this happens to cells they will either become turgid if water flows into them, or plasmolysed if water flows out of them, and thus change their volume, we want to test the hypothesis that:.
If the concentration of a solution into which a cylinder of potato is placed is greater than a certain level the cylinder will loose mass, and if the concentration is less than that level it will gain mass. This can be seen in living cells. The cell membrane in cells is semi-permeable and the vacuole contains a sugar/salt solution. So when a cell is placed in distilled water (high water concentration) water will move across the semi-permeable membrane into the cell (lower water concentration) by osmosis, making the cell swell. This cell is now referred to as turgid. If done with potato cells the cells would increase in length volume and mass because of the extra water. If these potato cells were placed in a solution with a low water concentration, then the opposite would happen. Water would move out of the cell into the solution. In extreme cases the cell membrane breaks away from the cell wall and the cell is referred to as plasmolysed.
Osmosis Plan An introduction to osmosis. ... Osmosis in humans The kidney is made up of a very large number of tubules. ... Osmosis in animals. ... Therefore osmosis occurs. ... Then I worked out whether the sac had gained or lost weight by osmosis. ...
Osmosis Aim: - To investigate the factors that effect the osmosis in potatoes. ... Fair test: - All these factors will have to be kept constant except the sugar concentration whilst doing the experiment to ensure that the investigation is a fair test: q Length potatoes- so that there is the same length of potato for osmosis to take place in. ... Preliminary Experiment: - In this preliminary experiment I will investigate the factors that affect the osmosis in potatoes. ... This would mean I would obtain precise and reliable results in my main experiment when investigation the facto...
I am going to investigate how the concentration of a sucrose solution affects osmosis in potato cells. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. Hypothesis: Osmosis is defined as the net movement of water or any other solution's molecules from a region in which they are highly concentrated to a region in which they are less concentrated. ... Some other Factors that effect osmosis are the: Temperature Surface area Time spent in the solution The shape and size of the potato used ...
Osmosis Osmosis is a kind of diffusion which only occurs with water. ... Results: A Table Showing the Raw Data Recorded from an Investigation into the Effect of Concentration on Osmosis in Potato. ... ato cells by osmosis. ... Rate of Osmosis in Potato Chips Skill Area P: Planning Aim: To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size. ... For this particular investigation I think that the lower the concentration of the sugar solution in the test tube the larger the mas...
Abbey Cappel November 24, 2014 Abstract This experiment will examine properties of a semi-permeable plasma membrane by investigating how different solutions react when placed in a dialysis tube surrounded by another solution. ... Key Words: semi-permeable, membrane, diffusion, osmosis, concentration gradient, homeostasis, isotonic, hypotonic, hypertonic Introduction The dependence of life processes on diffusion mechanisms could not be more prevalent. ... The spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high...
Aim In this investigation I will be finding out the effect of osmosis on potato chips at different concentrations of sucrose solutions. ... The greater the concentration of water in the external solution the greater the amount of water that enters the cell by osmosis. ... By repeating the investigation twice it gives me the opportunity to find anomalous results which could be due to the amount of concentration used or from the time being stopped at the wrong time. ... Also when measuring the volume of the solutions it will stay at 20ml and I will make sure that the volume will stay the ...
Rate of Osmosis on Potato Chips Planning We have been asked to investigate the effect of osmosis on potato chips. ... I have chosen to investigate the effect of the water potential/concentration of solution on potato chips. ... This will allow us to see whether osmosis has taken place, and to what extent. ... This means that water paeticalscan diffuse into cells by osmosis if the cells are surrounded by a weak solution. ... e surrounded by a stronger solution, e.g. salt water, the cells may loose water by osmosis. ...
Introduction The Aim of this investigation is to observe diffusion through a semi-permeable membrane Is to record to rate of osmosis a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, until an overall concentration is reached through a semi- permeable membrane called diffusion. ... In this investigation the dialysis tubing represents the semi –permeable membrane. ... Random errors are the effects the precision of the measured values in the investigation. ... Yet the funnels does not ha...