• 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...

Introduction

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.

Middle

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.

Conclusion

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 type of inhibition involved is called non-competitive inhibition. This means that the lead binds to an area of the enzyme other than the active site but eventually distorts it as well. Lead is also able to block -COOH groups on the enzymes which contributes significantly to the inhibition of enzymes as well.

  2. Osmosis in Potato cells

    The volume of the solution was measured precisely for us. Original length and original mass of each potato chip. This needs to stay the same in order to make a fair comparison to the other chips. The chips were cut for us to the same length and size using the same methods for each chip.

  1. Investigation on Osmosis using a potato.

    This was because, if I had weighed the potatoes with the bowl, then I would have to take the weight of the bowl away from that result. Safety As explained before safety is very important and the same procedures will be taken to avoid all injuries and hazards: We will

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

    = ?p + ?s. Plant cells are surrounded by a strong cellulose containing cell wall. This means that they can sustain much more pressure than animal cells so pressure potential is more significant when examining plant cells. When water enters a plant cell through the partially permeable membrane the cell becomes turgid: this means that the cell continues to expand until filled.

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

    Moreover I think that the pigment will be transported by diffusion, and the rate of diffusion also increases with temperature. Therefore I predict that the temperature at which the pigment will start move is about 40�C. However I think that at 60�C the membrane will have completely broken, therefore all of the pigment will have got through the membrane.

  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.

    Also you can see the effects of osmosis better compared to a small potato chip. The volume of the solution can also effect osmosis by there being too little. For example if you have a volume of 10 cm3 sucrose and have a 30 cm chip then you will not see the full effect of osmotic activity.

  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