• 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 ...

    Potatoes - part of the experiment � Tissue paper - to dry the potatoes after the osmosis takes place � Balance - to weigh the potatoes � Cork borer - to cut out potato cylinders Planning Before actually planning the experiment, I will do some research to find out about

  2. Osmosis Investigation

    From the graph, we see that as the molarity increases, the percentage difference decreases and with very high concentrations becomes a negative value. Therefore, from my predicted graph, I am stating that with concentrations higher than that of the potato cell sap, there will be a negative percentage difference in the length and mass of the potatoes.

  1. 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.

  2. Osmosis investigation

    The scales I used were sensitive enough to be able to detect changes of 2 decimal points, which increased precision and accuracy of results. 4. By getting repeated measurements (the 3 different chips) I reduced the effects of random errors because I made an average of the 3. 5.

  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 ...

    Water will diffuse from a region of higher to a region of lower potential. Water potential values (?) Higher Lower Direction Zero 0 of water Less negative - 500Pa diffusion More negative -1000 Pa The water is in fact diffusing from: the weaker solution (high solution)

  1. Structures and functions in living organisms. Revision Notes

    in light intensity LIGHT INTENSITY In bright light, the circular muscles contract and the radial muscles relax. The pupil constricts In dim light, the circular muscles relax and the radial muscles contract. The pupil dilates FOCUS Focusing on distant objects, ciliary muscles relax and suspensory ligaments pulled tight to make

  2. Biology-2 QWC Practice Questions & Answers

    Furthermore, some people may be allergic to the enzymes if they are left on the clothes, and so this is a flaw in its production, but it can be argued that some people could still be allergic to substances found in natural detergents, and they do not work as effectively.

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