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

I am going to investigate the effect of the concentration of sucrose solution on Osmosis in potato cells. I am going to do this by setting up an experiment in which I can alter dependant variables and independent variables.

Extracts from this document...

Introduction

Osmosis in potatoes To investigate the effect of concentration of sucrose solution on Osmosis in potato tissue Plan I am going to investigate the effect of the concentration of sucrose solution on Osmosis in potato cells. I am going to do this by setting up an experiment in which I can alter dependant variables and independent variables. Factors that would affect osmosis in the investigation are: * Surface area of the potato. The larger the surface area of the potato the more water it can absorb. There will be more cells to absorb more water. * Concentration of the sucrose solution. The more concentrated the solution is the less water there is in the solution. The less concentrated the solution is the more water there is in the solution. * Volume of sucrose solution. The volume of sucrose solution must remain the same throughout the experiment for the results to be fair. * Time. The longer the tissue is kept in the solution the more time osmosis has to take place. If the tissue is kept in the solution for too long the tissue will be damaged and results will be hard to obtain. But if too short, osmosis will not have enough time to take place. * Temperature. The warmer the temperature that the experiment is done in, the more energy the particles have, so they will move around in the test tube faster and osmosis will take place faster. ...read more.

Middle

Be sensible with equipment, e.g. knives. Any broken test tubes must be thrown away quickly to avoid people cutting themselves. Procedure: I collected 18 test tubes and placed each one in a test tube rack. On each test tube I placed a sticky label saying which concentration is in the test tube and which number repeat it is. I used a small measuring cylinder, which reads up to 10cm3. For the concentration of 0.0M I measured 10cm3 of distilled water. For 0.2M I measured 8cm3 of distilled water and 2cm3 of sucrose. For 0.4M I measured 6cm3 of distilled water and 4cm3 of sucrose and so on for each molarity. The readings I took from the measuring cylinder were from the bottom of the meniscus because water clings to the sides of the measuring cylinder. Before I place the pieces of potato in the test tubes with the solution I will make sure that I have filled each tube so that some of the potatoes have not been in the solution for longer than others. I will then after all test tubes have been filled with the right amount place the pieces of potato in the tubes, after these have been weighed. I will cut 18 cylindrical pieces from as few potatoes as possible with a cork borer, this makes sure they are equally round with the same circumference. ...read more.

Conclusion

* I would leave the test tubes with the potatoes in a water bath so they remain at a constant temperature. * When I dry the potatoes I should make sure that I dry them all the same amount of time. I should do this because the tissues I used could have absorbed more water from the potatoes. * To make my results more accurate I could do more concentrations than I did. Instead of 0.0, 0.2, 0.4, 0.6, etc I should use 0.0, 0.1, 0.2, 0.3, 0.4, etc up to 1M. * I could possibly use another vegetable. During my investigation nothing went wrong. There was nothing unexpected that happened. However my results were not what I expected. The results that I obtained, from the experiment to determine if my investigation was right, showed that my results from my primary investigation were inaccurate. The secondary results showed that my cell sap concentration was closer to what I predicted at the beginning of the investigation. I think that I got the results in my primary investigation because of inaccurate measuring of the liquids. From my graph I can see that there is an odd result at the molarity of 0.6M. The graph follows the pattern that I predicted in my hypothesis but the results do not follow the pattern that I predicted. The results that I obtained had a cell sap concentration at a very different molarity than I predicted. In my Biology Coursework, Osmosis In Potato Tissue Elaine Mostert 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Life Processes & Cells 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 GCSE Life Processes & Cells essays

  1. Marked by a teacher

    Investigating the effect of sucrose concentration on osmosis in potato cells

    4 star(s)

    osmosis, for example, it would allow me to work out the concentration at which the potato will begin to gain water rather than lose it. If I also measure the percentage change in mass rather than length, I can draw a graph to allow me to further analyse my results and find the water potential of the potato cells.

  2. To investigate the factors that effect osmosis in living tissue.

    It was also shown that the protein molecules are arranged in a type of mosaic arrangement. From these two properties the Singer-Nicholson model is often known as the fluid-mosaic model. Below is a diagram of the cell-membrane as proposed by Singer and Nicholson: The proteins found in the above model

  1. Osmosis is defined as 'the movement of water molecules from an area of high ...

    The chip must be totally covered in the solution, and the amount of solution will be kept the same because all the chips are the same size. The amount of solution I cover each chip in will be 25ml. The type of potatoes I will use is going to be

  2. Osmosis. To investigate which sucrose concentration is the same as the concentration of cell ...

    Average Change in Mass of Potato Chip (g) Increase or decrease in Mass 12 1.00 0.97 0.03 Decrease (-) 14 1.00 1.04 0.04 Increase (+) 16 1.00 0.70 0.30 Decrease (-) 18 1.00 0.82 0.18 Decrease (-) 20 1.00 0.69 0.31 Decrease (-) Results Table: Sucrose Concentration (%)

  1. Use scientific knowledge and practical skills to determine the effect of a range of ...

    In my investigation I am going to be investigate the factors affecting the rate of Osmosis. Some factors affecting this are: Length - of membrane Temperature - of water Concentration - of solution The factor I am going to investigate is the length.

  2. Experiment investigating concentration of sucrose solution and potatoes

    Pat the potato dry. Then weigh it to see its mass, record this amount in a results table. I will weigh the potato to two decimal place, if the scale reads three decimal place I will round up or down.

  1. In this experiment I intend to investigate the effects of osmosis on potato cells. ...

    On the other hand, when placed in a solution of unequal water concentration a potato cell will lose or gain water and weight as a result. If I can test samples of potato in varying concentrations of water, then I can attempt to find the concentration closest to that within

  2. A Sc1 Investigation into the effect of Concentration on Osmosis:

    By mixing different concentrations the experiment can be carried with a number of different salt solutions therefore fulfilling the need to investigate how different levels of concentration affect osmosis in potato. Varied: Concentration (of salt solution) Controlled: Temperature. Surface Area (of potato).

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