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

Investigation of the effect of surface area on the rate of osmosis of a potato

Extracts from this document...


Investigation of the effect of surface area on the rate of osmosis of a potato Introduction I have been asked to investigate the factors that may affect the rate of reaction in osmosis. OSMOSIS is the movement of water molecules across a partially permeable membrane from a region of HIGH WATER CONCENTRATION to a region of LOW WATER CONCENTRATION. I have chosen to investigate the effect of the surface area of potato chips. In this experiment is to find out if osmosis occurs between the cut surface of potato and sodium chloride solution, how surface area affects this. Last year we were asked to do a series of experiment about Osmosis. The method I used then is similar to this time. The only difference from last time will be, I'm using test tubes to place the chips and sodium chloride in. The reason for this is because; the chips need to be fully covered with sodium chloride solution. From last year experiment my conclusion was, the more surface area the chips have got, the faster and the more osmosis occurs. And I believe I will get the same result this time. There are other factors involved and these are; � Temperature - Higher temperature will make the protein denatured � SIZE of potato ...read more.


After that, we weight all the chips (*for safety reason, we should cut on a white tile, and we should always keep out fingers on the other end of the potato chip, so we don't cut ourselves); to see whether they are all in the same mass or not. We then put the first chip into the test tube, when we are going to put the first chip into the second test tube, we chop it in half, and on the third test tube we chop it into three pieces, so on. Finally we pour 25ml of sodium chloride into the dishes and put the bung on. Wait for 10mins, and then we take the chips out and dry them and weigh them. This is a diagram showing potatoes covered with sodium chloride solution in the test tube. Prediction Osmosis is defined as "the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration". In a high concentration of water the amount of solute (e.g. sugar) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute (e.g. ...read more.


My final results were very reliable, due to the precautions I took to make this a fair test. And I have checked my result with the others to see whether they got a same sort of result. Looking at the overall experiment I have thought of a number of improvements to give me more and better accurate results. Firstly the concentrations were measured using a measuring cylinder and could be made more accurate using titration. Also when the potato was dried to remove surface liquid it was not necessarily done the same on each potato, a more accurate and uniform way of drying would improve the accuracy further. Another thing I could have done to improve my result was to measure the diameter change of the potato, which would have helped me to find out the volume before and after of the potatoes, which would also help me to explain the results obtained. If we want a better result, we can set one for a longer period of time, for each set, which would lead us to better results, because the osmosis action would reach equilibrium its maximum ability, and therefore tell us how much water could be transferred for each solution. Finally, I'm pleased with my initial prediction because osmosis has happened. ?? ?? ?? ?? ...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 the Rate of Osmosis in Potato Chips.

    5 star(s)

    If the water in the experiment was replaced with a dilute sugar solution, there would still be a concentration gradient and water would diffuse in the same direction into the sucrose solution of high concentration because the concentration of water is lower there.

  2. Marked by a teacher

    Investigate the effect of surface area on osmosis in potato tissue.

    4 star(s)

    Another variable also includes the conditions the beakers are left in, such as temperature. The temperature was all the same for both experiments as I did them in room temperature in the same room, therefore the temperature was not too high as too much heat will denature the cells therefore not allowing osmosis to take place.

  1. Osmosis investigation

    Precise and reliable measurements: 1. Apparatus and testing procedure stayed constant, which reduces random errors from unknown influences. 2. I used simple apparatus that I have been familiar with since year 7. This meant I did not have any problem reading information off measuring cylinders and knew the difference between boiling tubes and test tubes.

  2. Investagating the Action of the Enzyme Catalase On the Surface Area of a Potato.

    decomposed the hydrogen peroxide at different speeds producing different amounts of oxygen at ten minutes. Specifically, I realised that as I increased the surface area of the potato (which also increased the amount catalase in the experiment), more oxygen was produced at ten minutes.

  1. Aim: To find out the effect of altering the concentration of sugar solution on ...

    Overall the preliminary experiment worked according to the plan and the results obtained were also in line with what I expected. Method for Main Experiment Now that the preliminary investigation has been carried out I am in a position

  2. Experiment to investigate the effect of surface area on the rate of reaction.

    Apparatus List * 2 Measuring cylinders - 10cm3 for measuring the hydrogen peroxide and gathering the oxygen produced * Delivery tube - Carry the oxygen produced to the measuring cylinder. * Potatoes - The source for the enzyme, Catalase. * Scalpel - Dividing the potato up cleanly and precisely.

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

    Appropriate Equipment. 1. 5 test tubes for each molarity level (35). 2. Bungs for test tubes (35). 3. Labels for test tubes (35). 4. Test tube rack for each molarity level (7). 5. Bungs for test tubes (35). 6. Scalpels for cutting potato samples. 7. Cork borer. 7. Cutting board.

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

    Lipid molecules Interior of cell However, in the early 1970's a more sophisticated model of the plasma membrane was put forward by S.J. Singer and G.L. Nicholson. Their research showed that the membrane was actually far less rigid than earlier believed.

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