• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Osmosis in Living Tissue.

Extracts from this document...


Will Carroll 01 May 2007 Osmosis in Living Tissue Planning Osmosis is the movement of water from a high water concentration to one of low water concentration, through a selectively permeable membrane. The object of this is to even out the concentrations of the solutions, regardless of the volumes of the solutions. Osmosis Diagrams: Plasmolysis: Movement of Molecules The movement of molecules inside a solution of high water concentration is fast, and so they have more chance of getting through the semi-permeable membrane, and changing the concentration of the solution that has a low water concentration. The things that change the rate that osmosis occurs are: * The Concentration * The Surface area * The Temperature The concentration affects the rate of reaction because if one of the solutions is pure water, and the other is very concentrated with sucrose, the rate will be faster as there are more molecules to move past the semi- permeable membrane, so they will move faster. The surface area affects the rate of osmosis because it means that there will be more of the semi-permeable membrane for the molecules to collide with, and penetrate through. ...read more.


0.0 17.0 0.0 -1.4 -3.3 14.7 -3.3 8.0 10.0 1.0 3.3 -8.0 -3.3 18.9 0.6 -3.6 -3.3 -7.4 -6.6 6.2 1.0 -5.5 -3.3 -11.4 -3.3 10.0 3.2 -2.4 -2.6 -11.0 -5.2 The Constants: * The dimensions of the chip * The amount of solution * The concentration of the solution * The room temperature * The time in the solution In this investigation we are measuring the mass and the length of the chip, before and after it was put in the different solutions. Here is a graph of the Preliminary results: Prediction: The prediction that we have made for this experiment is that when the concentration of the sugar solution increases, the mass and the length of the chip will decrease. This is because when there is more sugar in one of the solutions, then osmosis will take place, and will level out the concentrations of the two solutions. This can be proved from the results of the preliminary experiment, as when the solution was 1.0 mol/dm�, the percentage mass change was -11.0, and the percentage length change was -5.2. ...read more.


0 -10 -3.3 1.0 1.0 1.0 0.8 0.9 0.9 -0.2 -0.1 -0.1 -20 -10 -10 -13.3 1.0 1.0 1.0 0.9 0.8 0.8 -0.1 -0.2 -0.2 -10 -20 -20 -16.7 Conclusion The results show that our prediction was right, I that when the concentration of the sugar solution increased, the mass and length decrease. This is because of osmosis. There are more water particles in the chip than the sugar solution, so the water molecules pass through the membrane and level out the concentration of the solution. When there is a higher sugar concentration, more water has to be taken from the chip so the mass and length decrease, as 75% of the chip is water. Once the concentrations are balanced, osmosis does not stop, but carries on keeping the levels the same. This can be done because it is not active, and does not use energy to pass the molecules through the membrane. Evaluation To improve the accuracy of this experiment, we could have; * Weighed all of the pieces of chip separately. * We could have timed the length of the chips being in the fridge, and kept it constant, and not roughly 3 days after ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Determining the Water Potential of Sweet Potato Tissue

    4 star(s)

    2.9 0.60 1.86 3.0 1.69 2.9 Results from a similar experiment Measurements before Measurements after Sucrose solution (M) Mass (g) Length (cm) Mass (g) Length (cm) 0.00 2.07 3.1 2.52 3.3 0.00 2.13 2.9 2.59 3.2 0.10 2.20 3.1 2.44 3.1 0.10 2.23 3.2 2.50 3.2 0.20 2.13 3.1 2.31

  2. Peer reviewed

    Effect of Caffeine on the Heart Rate of Daphnia

    3 star(s)

    * Heart beat or beating of legs of the Daphnia can be very fast when it is in 0.3-05% of caffeine solution. Missing a few beats when counting the heart beat or beating of legs is almost inevitable. An improvement to this is to set a video camera above the eyepiece so that the heart beat of Daphnia (water flea)

  1. Investigating osmosis on swede cells.

    If this anomalous result was not considered then the average of the two results would be 7.45%, decreasing the average nearly by half and if this result was potted it would not fluctuate and a slope would be formed. The result for 1.0M is also abnormally high and although it

  2. Investigation on Osmosis using a potato.

    it the same way, taking the reading to the nearest 2 decimal places. We will also be reading the measurements of the measuring cylinder by reading the bottom of the meniscus which will give us the most accurate results. Carrying out the experiment in a constant throughout the experiment is important.

  1. Design an experiment to investigate the effect of temperature on the movement of a ...

    first placed in the test tube, so I get an accurate colorimeter result. 9. Check that the water inside each of the test tubes has heated up to the few minutes until they are the right temperature. If they haven't leave them for a few minutes until they are the right temperature.

  2. effects of concentrations of sugar solutions on potato chip cells

    I decided I would measure the mass of the chips instead of the length to take my results from as this is a much more accurate way of doing it as you can only measure to the nearest mm with length but can measure to the nearest mg using mass.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work