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

Osmosis In Potato Cells

Extracts from this document...

Introduction

SCIENCE: Osmosis In Potato Cells Task In this experiment, our task was to investigate the effect osmosis had on the mass of a potato chip. Research: Osmosis is when the molecules move around a solvent, through a semi-permeable membrane, lowering the concentration of a solute on the other side of the membrane. The purpose of this is to match the two sides of the membrane, so they are balanced. This is caused by osmotic pressure, an irreversible type of diffusion. This is when molecules jump from one place with a high concentration to another with a low concentration. Diffusion is important for many things, especially in the human respiratory system, when the alveolar membrane of the lung separates the carbon-dioxide filled blood with the oxygen-rich air. Plan: To determine the rate of osmosis in a potato chip, we can treat a number of different chip specimens with different solutions. These are distilled water, 5% sucrose solution, 10% sucrose solution, and also 15% and 20% solutions. We shall be testing this experiment with thin slices of potato, which will be easier for the osmotic pressure to penetrate wholly, as opposed t just the exterior. ...read more.

Middle

5. We will then leave the test tubes for a two days (the distance between lessons), so that osmosis will take full effect. 6. In the next lesson we shall record each chips' length and mass after drying them on tissue paper, so as not to contaminate the results with excess, exterior fluids. 7. Ideally, we would repeat this process at least twice more, but as the time is against us, we may have to borrow a set of results from another group in the class. 8. We will then record all our results that have already been recorded into tables, into graphs. Equipment: The equipment we will need is: * A scalpel, * A ruler, * Five test tubes of equal size and larger than 4cm long and 2cm2 wide, * A test tube rack, * A heatproof mat (or an alternate surface to prepare the potato chips) * A potato, * Five different types of solution; one distilled water, one 5% sucrose, one 10%, one 15% and one 20% sucrose solution. ...read more.

Conclusion

G1 G2 G3 G1 G2 G3 Distilled Water 4cm 4cm 4cm 5.30 8.88 7.97 5% solution 4cm 4cm 4cm 5.54 7.45 4.07 10% solution 4cm 4cm 4cm 5.38 7.98 3.20 15% solution 4cm 4cm 4cm 5.50 4.20 4.19 20% solution 4cm 4cm 4cm 3.79 3.97 4.57 This is the overall change: Solution G1 G2 G3 Average Distilled Water +0.82g +0.89g +0.98g +0.90g 5% solution +0.09g -0.01g -1.05g -0.32g 10% solution 0.00g -0.40g -1.10g -0.50g 15% solution -0.81g -0.93g -1.12g -0.95g 20% solution -1.27g -1.09g -1.54g -1.30g Conclusion: I believe my prediction was correct when I stated that the higher the concentrate of sucrose solution is in proportion to the weight loss in the chips. I was also correct when I said the chip placed in distilled water would gain weight. Analysis: The chip in the distilled water gained weight and got larger in size. This is because the distilled water penetrated the potato, and stayed there, making it weigh more. My results also prove my prediction that the chips in the solutions would lose weight. ...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. Osmosis in Potato cells

    Analysis To simplify the results I made two separate tables based on the percentages of the changes noticed for each solution, for each student and plotted two graphs in Excel to demonstrate the data and I have also hand drawn the graphs on page 11 .

  2. Investigating osmosis on swede cells.

    Eventually an equilibrium is reached when the water potential has decreased to that of the external solution. The point at which pressure potential has just reached zero and plasmolysis is about to occur is referred to as incipient plasmolysis.

  1. The Endocrine System

    Instances of positive feedback certainly occur, but negative feedback is much more common. Negative feedback is seen when the output of a pathway inhibits inputs to the pathway. Feedback loops are used extensively to regulate secretion of hormones in the hypothalamic-pituitary axis.

  2. Investigation on Osmosis using a potato.

    * We will use the same potato throughout the test so there will be no change in concentration gradient for all the potato cylinders. * We will take down the mass once then 2 hours later to check that osmosis or plamolysis occurs any more.

  1. Blood System Assignemnt

    Group O Blood This has neither A or B antigens on the red blood cell but both A and B antibodies in the plasma. The above blood groups are the most common blood groups; it does not matter which blood group you are until a transfusion is required, the following

  2. Design an experiment to investigate the effect of temperature on the movement of a ...

    If the reaction vessel were too large then I would need a much larger volume of water. This would cause the pigment to become diluted, and the experiment would be less accurate. Range of temperatures I am going to use water baths at the temperatures of 25�C, 30�C, 40�C, 50�C, 60�C and 70�C.

  1. An investigation into changing the concentration of sucrose soltion on the rate of osmosis ...

    = ?p + ?s. Plant cells are surrounded by a strong cellulose containing cell wall. This means that they can sustain much more pressure than animal cells so pressure potential is more significant when examining plant cells. When water enters a plant cell through the partially permeable membrane the cell becomes turgid: this means that the cell continues to expand until filled.

  2. This experiment aims to investigate the effects of 4 different types of fish food ...

    This is done by ion exchange mechanisms found in the gills (unwanted ammonium ions exchanged for beneficial chloride ions). Salmon and saltwater fish on the other hand lose water to their environment due to the lower salt concentrations in their bodies, and must "drink" water to maintain the correct internal ion concentration (10).

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