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

What is the effect of changing the concentration of Sodium Chloride Solution on potato cells?

Extracts from this document...


Biology Investigation Title Investigating Osmosis Aim What is the effect of changing the concentration of Sodium Chloride Solution on potato cells? Prediction I predict that the lower the concentration of Sodium Chloride solution, the higher the final mass and length will be and the higher the concentration of Sodium Chloride solution, the lower the final mass and length. I also think that with a concentration of 0 and 1 molar, the change in mass and length will be greater than 0.125, 0.25 and 0.5 molar which I think will roughly stay the same. Osmosis is just a special case of diffusion. It is the net movement of water molecules across a semi-permeable membrane from a region of high water concentration to a region of low water concentration. In the diagram the water molecules diffuse into the concentrated sugar solution because the water molecules are small enough to pass through the membrane. The larger the sugar molecules are they are unable to pass through the membrane into the water solution. Osmosis will stop when the two solutions reach equal concentrations on either side of the membrane. ...read more.


Using a measuring cylinder measure 20ml of distilled water and pour into the test tube marked 0 molar. Prepare the Sodium Chloride solutions according to the table below. Concentration (molar) 1.0 0.5 0.25 0.125 Vol 2m NaCl (Gm�) 20cm� of 1.0m 10cm� of 0.1m 10cm� of 0.5m 10cm� of 0.25 Volume distilled water (cm�) 0 10 10 10 Into each previously marked test tube pour the correct solution and then place one chip in each test tube. Leave the test tube for twenty minutes. Remove the chips from the test tubes and dry with a paper towel. Re-measure the length and mass and record in a table. Repeat the experiment to obtain a second set of results. Results Set 1 Concentration (molar) Initial mass (g) Final mass (g) Change in mass (g) 0 0.8 0.9 +0.1 0.125 0.9 0.9 0 0.25 0.9 0.9 0 0.5 0.9 0.8 -0.1 1 0.9 0.7 -0.2 Concentration (molar) Initial length (mm) Final length (mm) Change in length (mm) 0 20 21 +1mm 0.125 20 20 0 0.25 20 20 0 0.5 20 19 -1mm 1 20 18 -2mm Set 2 Concentration (molar) ...read more.


My prediction was therefore correct. Evaluation My investigation in general worked very well. We obtained accurate results that we needed to draw a firm conclusion and all went according to the initial plan. There were no anomalous results in this investigation. I think that our method did work but it would have helped during the experiment if it was more detailed. I would think about rearranging some of the points and maybe doing some parts of the experiment differently or in a different order as we did seem a little unorganized throughout the experiment. If I was to do the experiment again I would label all of the test tubes before starting the experiment to avoid farther confusion. I do think we obtained enough results to draw a firm conclusion and the averages proved to produce an accurate graph for both the length and mass of the potato chip. I think our only concern would be that the length of the chip may not be perfectly accurate each time because of the measuring device used. Our results were all repeatable and followed the line of best fit. There were no anomalous results so I would therefore conclude that our experiment was a success and our results were reliable. ...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

    Biology coursework planning - the effect of lead chloride on the growth of cress ...

    5 star(s)

    The electron transport chains affected in photosystem I and photosystem II in the chloroplasts means that enough ATP and reduced NADP may not be produced. This would mean that macromolecules required by the plant to grow may not be made.

  2. Osmosis in Potato cells

    * A white tile was used on which to cut the potato chips. * The solutions were measured out for us and left in plastic containers clearly labelled distilled water 10% sucrose, 15% sucrose etc. * Paper towels were used to dry the potato chips once removed from the solutions.

  1. Investigation on Osmosis using a potato.

    = 0.9 molar sucrose solution 30 This experiment shows that my hypothesis was very close to the actual experiment, this explains that the research conducted and the theory applied to my prediction was sufficient enough to predict accurately. When the figures on the percentage column on the table start to

  2. An investigation into changing the concentration of sucrose soltion on the rate of osmosis ...

    And because the plant cell wall is so strong and rigid the cell will not burst. Sometimes in plant cells there is a process called plasmolysis which occurs. This is where the protoplast begins to decrease in size and water moves out of the cell, due to a higher water potential outside the cell.

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

    tubes in it, to ensure that it has heated up to the correct temperature. Also when I put the beetroot into each of my test tubes I will use a thermometer to check that they have heated up to the right temperature.

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

    48hours then I would not be able too see the real effect of a concentration on osmosis because the time also is a factor of how much osmosis takes place. I will leave all my experiments for 24 hours. Osmosis is a special case of diffusion.

  1. We will be investigating osmosis and its effect on potato chips.

    Variables: Size of chip, volume of solution, time, temperature, pressure and type of potato. Non Variable: Concentration of solution. Now I shall discuss how the variables could affect osmosis. The size of the chips matter because if the size of the chip is bigger then there is a better chance of accuracy and evaluation.

  2. Investigate whether the different concentration of sugar solution will affect the weight and size ...

    This will allow us to see whether osmosis has taken place, and to what extent in the different solution. The volume of the solution that the potato chips are kept in must be equal. All potatoes must be totally covered in the solution, and the amount of solution will be

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