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

Determination of the water Potential of cells of bulky tissues by a weighing method

Extracts from this document...

Introduction

Determination of the water Potential of cells of bulky tissues by a weighing method Aim The aim of this experiment is too find the water potential of the potato cells by a weighing method. Prediction I predict that as the concentration of sugar solution sucrose is increased, the mass of the potato will go down more and more thus the water potential decreasing as well. This is because the water molecules move to where there is a region of low water potential from a region of high water potential. So when the solution is one molar of sucrose there is a very low water potential because there is no water in it. ...read more.

Middle

5. Now I could start adding the different molar of sucrose to the test tubes and I labelled each one so I know which test tube had which molarity in. 6. I left the solutions for a good hour and then I weighed out the potato again and recorded it down on paper. I did this with all the pieces of potato and then found out the percentage change in mass with each one. Concentration of sucrose Weight before (g) Weight after (g) Change in mass (g) % change in mass 1 Molar 1.21 0.89 0.32 3.9 0.9 Molar 1.23 0.92 0.31 3.8 0.8 Molar 1.1 0.81 0.29 3.2 0.7 Molar 1.15 0.89 0.26 3 0.6 Molar 1.13 0.91 0.22 2.5 0.5 Molar ...read more.

Conclusion

I know this because in my table it shows that when the concentration of sucrose was decreased the change in mass also decreased until the potato ended up gaining weight which at this point meant that the solution of water and sucrose had a greater water potential than the potato. Evaluation My experiment was fairly accurate and my results seem to be fairly normal. If I was doing the experiment again and had more time I might of done each concentration of sucrose twice or a few times and I would of taken an average of these results. This would be more accurate because something could go wrong if I was only doing each one once like you might use the wrong concentration for one of them. I think I left my experiment long enough for affective osmosis too take place. ...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. Marked by a teacher

    Investigate the water potential of celeriac.

    5 star(s)

    that when the carrot was heated in a water bath, the solution of Benedict's reagent turned from the Copper II Sulphate blue, to a brick red precipitate. Whereas when the potato was heated in the water bath, the colour change was from the Copper II Sulphate blue, to an orange precipitate.

  2. Marked by a teacher

    Osmosis. Aim: To find the molarity of potato tubers cell sap. BIOLOGICAL ...

    4 star(s)

    At a particular concentration there would be no net movement into or out of the potato strips. This is because both are of the same concentrations. This concentration would give me the molarity of the cell sap. I can determine this concentration by plotting a graph similar to the one shown below.

  1. Marked by a teacher

    Determining the Water Potential of Sweet Potato Tissue

    4 star(s)

    This is called plasmolysis and the cell becomes flaccid. If the ? of the external solution is equal to the ? of cell sap, then the protoplast will not be pushed against the cell wall and there might be some gaps referred to as incipient plasmolysis.

  2. Osmosis in Potato cells

    In addition, my personal observations of whether the chips had become hard, soft or remained the same further supported my original prediction and demonstrated osmosis had taken place. Evaluation I feel that the experiment was successful and the results were fairly accurate.

  1. Investigating Water Potential Of Potatoes.

    However, this can also be dependent upon the concentration of the cells. If the concentration in the cell is higher than outside then osmosis will occur by removing water. However, if the concentration inside the cell is not too much more than out side the cell then osmosis will occur at a slower rate.

  2. Investigating osmosis on swede cells.

    but a slight fluctuation should not have dramatic effects on the experiment. Pressure Control Pressure shall remain at room temperature. Fair Test All variables, apart from the independent variable, must be kept constant in order to allow for a fair test.

  1. Find the water potential of potato cells.

    to occur, so that the chips would not differ in size enough for conclusive results. Therefore, I will need to give a good amount of time for the osmosis to occur. o Temperature - I believe that all reactions happen quicker when there is a higher temperature, so diffusion across the membrane may be faster at higher temperature.

  2. This piece of investigative work aims to prove, through two different experiments: 1. the ...

    Apparatus * * 6 x test-tubes * 1 x test-tube rack * wax pencil * cork borer * sharp knife * white tile * large tuber * filter paper * forceps * balance - accurate to 0.001grams * distilled water * 1.0 MOLAR sucrose solution * 2 x 25ml measuring

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