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

Find out the concentration of sucrose solution that is equivalent to the osmotic potential of Potato tuber cells.

Extracts from this document...

Introduction

Osmosis Investigation By Christopher Stylianou Aim The aim is to find out the concentration of sucrose solution that is equivalent to the osmotic potential of Potato tuber cells. Factors All the independent variables, which could affect the investigation of Osmosis, are: > Mass- By changing the size of the cell could change the amount Osmosis occurring. > Concentration of Solution- By changing the concentration of the solution surrounding the cell could change the amount of Osmosis occurring. > Temperature- By changing the temperature of the solution or cell could change the amount of Osmosis occurring. > Size- By changing the surface area of the cell could change the amount of Osmosis occurring. Investigation I have decided with the research I have below to investigate the Concentration of the Sucrose Solution independent variable. This is because I can use a scale of 10 different solutions. E.g.: - 1 Molar of Sucrose Solution to Water or 0 Molar of Sucrose Solution to Water. Then I can work out how much each cell has gained or lost by weighing them and then see which is the nearest Potato tuber cell not to change it's concentration from the beginning will be the right concentration of sucrose solution to equal the concentration inside the Potato tuber cell. ...read more.

Middle

Water (cm�) 1 Molar 30 0 0.9 Molar 27 3 0.8 Molar 24 6 0.7 Molar 21 9 0.6 Molar 18 12 0.5 Molar 15 15 0.4 Molar 12 18 0.3 Molar 9 21 0.2 Molar 6 24 0.1 Molar 3 27 0 Molar 0 30 Mix the solutions using a glass rod. Then take 11 of the potato tuber cells (potato cubes) and place 1 into each beaker. Then set the timer on and leave for 24 hours. Repeat this again to get two sets of results. After 24 hours, take each potato tuber cells out of their beakers and wipe off any excess solution. Then weigh each cell again and record this into your results. Then work out how much weight the cell has gained or lost in each solution by subtracting the starting weight by the finishing weight. Fair Test: - To make it a fair test you must carry out these precautions: - * The measuring and the Sucrose and Water are accurate by using a measuring cylinder. * Don't use the same measuring cylinder for the Sucrose and the Water because it might contaminate the solutions and make it an un-accurate and un-fair test. * Make sure that each potato tuber cell is 1cm� and doesn't have excess liquids on them. ...read more.

Conclusion

Also, the temperature, mass or/and surface area of the potato tuber cell could have changed which would affect the results. I think my method is good because you can get accurate results by using simple apparatus and knowledge. But it could improve my method by controlling the other factors better by making sure that the potato didn't have any kind of excess liquids on it, the mass was the same weight every time and the surface area was the same size every time. I could only do this with special equipment that wasn't provided for this experiment. Also, if we put the experiment in a controlled temperature environment, this wouldn't affect the results either. I had preliminary work to help me with the investigation, which was very useful in making my prediction. But now I have done the experiment, I could concentrate around the 0.3 - 0.4 Molar Sucrose Solution and go up in hundredths instead of tenths to get a more precise result. I could do another experiment which the same method but instead of using sucrose, I could use a different mineral to see if it will affect the results in anyway. E.g.: - Starch. I got my research from the Biology GCSE textbook and from the Internet- http://www.purchon.com/biology/osmosis.htm ...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

    Investigate the water potential of celeriac.

    5 star(s)

    This measured the percentage transmission of light through the test tube. Results from colorimeter % transmission of light Carrot 81% Potato 90% Celeriac 95% The results show that the celeriac let most light through. This means that there was much less precipitate than the carrot or potato.

  2. Marked by a teacher

    The Effect Of Temperature On The Permeability Of The Cell Membrane

    3 star(s)

    permeable membrane, between 20 to 40 degrees Celsius, the tonoplasts which are the vascular membranes leak but at 60 degrees Celsius the tonoplasts will disrupt completely, so overall I predict that as temperatures increases from 20-40 degrees Celsius, the rate of diffusion and absorbance rate increases but at 60 degrees Celsius diffusion and absorbance rates rise dramatically.

  1. Peer reviewed

    Osmosis. Finding the water potential of potato tuber cells

    3 star(s)

    Label the molarity of the solution 7. Repeat with the 6 other amounts to make all 7 solutions Table 2 Molarity (mol dm3) Water Potential (kPa) Ratio of water to sucrose solution to be used making the solution 0.00 �0 100cm3 distilled water : 0cm3 Sucrose stock solution 0.10 -260 90cm3 distilled water : 10cm3 Sucrose stock

  2. Water Potential of Potato Tuber Cells: The Density Method

    Results Table Showing the Movement and Observations of the Drop for each Concentration Concentration (mol dm-3) 0.10 0.15 0.2 0.25 0.3 0.5 1 Movement and Observation of Drop Rise - remains quite close to solution surface. Rise - remains close to solution surface.

  1. An investigation to see whether the concentration of Sucrose effects the amount of Carbon ...

    I did encounter a few anomalous results. They were all similar though. One of these similar anomalies was that between the first and second day of the experiment the mass lost for the 1% concentration solution was 1.61g and the mass lost for the 20% concentration solution was 0.45g.

  2. Investigating Water Potential Of Potatoes.

    FAIR TEST In order to make this test fair, there are many things that will need to be constantly checked. Some of the key variables that can be changed are: * Temperature * Surface area of potato * Volume of Solution * Weight of potato * Concentration.

  1. Osmosis in Potato cells

    To explain why the control variables had to be controlled and how they were, I have drawn up a table below: Control variables Why it has to be controlled How I will control it Type of potato. Different potato types contain more water than others, if it were not controlled

  2. Investigation on Osmosis using a potato.

    weight should decrease or increase, not noticeable for us to observate efficiently. But because of such high molars of sucrose, the water can diffuse all the way, throughout the two substances, equalling the concentration gradient of the two substances. If this experiment was accurate enough then there will be no

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