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

sucrose concentration affects potato cells

Extracts from this document...


How do solutions of various concentrations affect potato cells? Aim: Do the masses of potato cells change when affected with different concentrations of sucrose? Hypothesis: The lower the concentration of sucrose, the higher the mass of the potato piece. Justification: The more dilute a sucrose solution is, the more water there is. Since osmosis is the movement of water from high water concentration to low water concentration through a partially permeable membrane, it is expected that the higher concentration of water in sucrose with low molarity will increase the mass of potato cells. Therefore, a hypotonic sucrose solution (low molarity) will increase the mass of potato pieces as potato cells will become turgid as water enter the cells and hypertonic sucrose solutions will decrease the mass of potato pieces as water will move outside of the potato cells to a less water-concentrated solution. Variables Independent: Concentration/molarity of sucrose - 0.00M (water only), 0.25M, 0.50M, 0.75M, 1.00M (sucrose only Dependent: The mass of potato pieces Controlled: * Size of potato pieces (5.4�0.5mm) * Temperature of solution and surrounding temperature * Volume of solutions (20cm�) ...read more.


(g) Trial 2 (Final mass - Initial mass) (g) Trial 3 (Final mass - initial mass) (g) 0.00M (water only) 0.02 0.07 0.06 0.25M -0.01 -0.01 -0.17 0.5M -0.1 -0.05 -0.08 0.75M -0.13 -0.11 -0.14 1.0M (sucrose only) -0.16 -0.17 -0.15 Percentage change of the initial and final mass of the potato pieces Molarity of the potato pieces immersed in Trial 1 (mass difference � initial mass � 100) (%) Trial 2 (%) Trial 3 (%) Average percentage change (%) 0.00M 4.17 10 8.45 7.54 0.25M -1.61 -1.64 -23.94 -9.06 0.50M -18.18 -6.5 -12.5 -12.4 0.75M -16.46 -22 -20.59 -19.68 1.00M -29.63 -17.71 -22.06 -23.13 Discussion The graph of the percentage change of the mass of the potato pieces shows a negative correlation. It shows that the percentage change of the mass of the potato pieces decreases as the concentration of sucrose increase. This also means that the mass of the potato pieces increase and then decreased as the concentration of sucrose increased. The results of this experiment suggests that through osmosis, water entered the potato cells in lower concentration of sucrose and water left the potato cells in higher concentrations of sucrose. ...read more.


That way, we will have a more accurate graph and we will get a more accurate estimation for the isotonic point. Since we had to consider the amount of time we were given, we could only do 3 trials More accurate results could be obtained if we worked on more than 3 trials. For example, 5 trials. The more trials we have, the more valid the average will be. This could also help defeat any anomalies in the raw data. One of the uncertainties that have been identified is the measurement of water and sucrose. To defeat the uncertainty, it more accurate to use a longer and thinner measuring cylinder than the 100cm� that was used. If possible it could be more accurate to use a burette or a pipette. Conclusion The experiment that I have conducted has given me valid results. After calculating the results and graphing the percentage change of the mass of the potato pieces, my hypothesis was proven to be correct. From the negative correlation that my graph has shown, I can confirm that as the concentration of sucrose increase, the mass of the potato pieces will decrease. ?? ?? ?? ?? Syazana Asmuni 12 b ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. The effect of concentration of sucrose solution on the osmosis in potato

    50 * Potatoes 2 * Tissue paper 5 * Electronic Weighing scales 1 * Cork borer 1 * Ruler 1 * 20 cm3 measuring cylinder 1 * Test tube holder 2 * Tweezers 1 Practical Safety and Risk Assessment Refer to Appendix IV - QAHS STUDENT ACTVITY RISK ASSESSMENT and

  2. The aim of the investigation is to find out how an increase in surrounding ...

    The trend is that as the temperature increases the mean percentage of absorbance increased too. From temperatures 0-40 (C) there was a gradual increase however, as the graph shows, it increased rapidly from temperature 40 to 60 and then gradually leveled out between 60-80 degrees.

  1. Testing the solute concentration of potato cells

    If the concentration of sucrose solution is higher than that of potato cell, potato piece would shrink in mass and length as water molecules inside the potato would go out of potato cell to the solution with the higher solute concentration.

  2. Investigating isotonic point of a potato

    Then label each beaker. 6) Place one group of three chips into each beaker and leave them for a day. To avoid evaporation cover them with tissue paper. 7) Next day take out the chips carefully and dry them using tissue paper, this is to make sure that there will be no effect in the mass of slices.

  1. Osmosis. By this investigation, I tried to find out the changes in potato ...

    The data from this investigation shows that there are different results for potato and sweet potato cylinders. Therefore, we know that water potential (and concentration of sucrose) inside the potato and sweet potato cells is different. On the other hand, in both, by increasing outside solution concentration, water potential was gradually increasing in the cell.

  2. Osmosis Experiment. This experiment is to consider how salinity influences osmosis in potato cells.

    This means that it is a very dilute solution. A low water concentration refers to the opposite, it is a concentrated solution. (1999 - 2010, Wisc-online) When a plant cell is put into salt water, one of three things will occur.

  1. Investigation of osmosis in potato strips by measuring the length of the strips after ...

    method: The different Sugar solutions were poured a beaker and each beaker was marked according to the concentration of sucrose poured into it . Potato pieces were cut into 30 strips using a ruler and a knife to have the same size with dimensions (0.5cm x 0.5cm x 4cm).

  2. Finding the isotonic point for potato tissue

    2. Between 0.3 M and 0.0 M, the mass of the potato stick increases as the concentration of sucrose solution decreases. 3. Between 0.32 M and 1.0 M, the mass of the potato stick decreases as the concentration of sucrose solution increases.

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