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

My aim throughout this investigation is to investigate the movement of Osmosis through a selectively permeable membrane which in this case is a potato chip.

Extracts from this document...

Introduction

OSMOSIS IN POTATOES. My aim throughout this investigation is to investigate the movement of Osmosis through a selectively permeable membrane which in this case is a potato chip. INTRODUCTION. Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes through from a high concentration to a place where the concentration is lower. Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of fluids in living organisms i.e in the transport of water from the soil to the roots of a plant. If a cell is in contact with a solution of a lower water concentration than its own concentration then the water will leave the cell by osmosis, through the membrane. If you put a plant cell into water, water will enter the cell by osmosis and therefore the cell will increase in size and weight. Even though water will enter it will not get to a point where the cell will burst. ...read more.

Middle

as quickly as we could so that one potato chip didn't have any longer than the others. We left each one for around 30 minutes. After 30 minutes we emptied the petri dishes leaving only the potato chip inside. Before measuring and weighing each chip we put them onto a paper towel to remove any excess water that were on them otherwise the results would not be as accurate as they could be. We then measure the chips in mm as this is a more accurate measurement and weighed them in grams. FAIR TEST. This experiment will have to be kept as fair as possible otherwise the results would not be accurate enough. There are many thing that must stay the same. The room temperature, the size of the potato chip as it goes into the solutions, the time the potato is left in for and also the way of measurement or weighing at the end. The only thing that will change during the experiment is the concentration of the sugar or water solution. ...read more.

Conclusion

EVALUATION When it came to accuracy during this investigation it wasn't that easy. Having to keep things such as weight and length the same sounds quite simple but when you put this in to practice it doesn't work out quite the same. Even if you cut all potato chips to the same length it was very unlikely that they would all weigh the same. Another thing that I thought was not done very well was when we pulled the potatoes out of the petri dishes we had to dab them with a paper towel in order to remove some of the excess water but by doing this we could not be sure that we wernt removing any water that was not excess. Some of the results were anomalous and therefore something must have gone wrong somewhere. If I were to do this investigation again I would perform the experiment more times before hand so that when it came to the real one I would have more experience in knowing what do do and what not to do in order to keep the results as fair as possible. ...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. Osmosis is defined as 'the movement of water molecules from an area of high ...

    The average distilled water gains in mass. This means that osmosis takes place and that the water moves from the beaker into the potato. The matches my initial predictions, and fits in with my prediction graph as well. The point where the line crosses the x-axis is the isotonic point.

  2. Osmosis Investigation

    My observations can be tabulated as follows: Physical Appearance Molarity Initial Appearance Final Appearance 0.125M Normal Slightly thicker (turgid) Distilled Water Normal Thicker, longer (turgid) In the following table, I have taken the average length and mass values in order to be more practical.

  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. Osmosis, Aim: To investigate the movement of osmosis through a selectively permeable membrane, ...

    We will try our best to make sure that each potato slice is the same size with the use of a scalpel to slice potato chips to equal sizes. We will then weigh three potato chips to get their initial mass and then place the chips into six 100ml beakers.

  1. Osmosis Chip Investigation

    The chips will not be touched by human hands, as they secrete grease which could seal up some of the potato's surface area giving the chip a smaller surface area and so affecting the test, and will be handled exclusively with forceps.

  2. Looking at how concentration affects the movement of water particles through a partially permeable ...

    This tendency is increased of solutes. As solute molecules in a solution tend to prevent water molecules leaving it, the solution will have a lower water potential than pure water, i.e. its value will be negative. The more concentrated the solution the more negative will be its water potential.

  1. Structures and functions in living organisms. Revision Notes

    The back of the eye is the retina, which contains light sensitive receptor cell. The fovea is the most sensitive part of the retina. The optic nerve is the sensory neurone for the eye and carries electrical impulses to the brain.

  2. Biology-2 QWC Practice Questions & Answers

    Explain what happens in an athlete?s muscles when running Whilst an athlete is running at a small pace, their muscles are contracting and require oxygen from the heart in the form of blood to keep on moving.

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