• 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. Testing the solute concentration of potato cells

    In contrast, when potato piece has higher solute concentration, water molecules in sucrose solution move inside the potato, causing it to swell due to water uptake. Then, the potato would be longer and heavier. In short, to find out the solute concentration of potato cell, it is important to check

  1. Investigating isotonic point of a potato

    Therefore that was taken to be the anomaly, reason for the anomaly will be explained in the evaluation. Finding the isotonic point you must get the value of the x-intersect of the line. Therefore the isotonic point was 0.26mol. This isotonic point is when there is no osmosis occurring within the cell.

  2. investigating the water potential of potato cells

    amount separately; making sure that the balance is carefully zeroed before each weighing. 7) Record your raw data. You will need to process and graph the data. Use the processed data to estimate the water potential of the potato tissue in MPa.

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

    I couldn't see the any changes in 0.6 M. In 0.8M and 1.0 M potato cylinder looked like getting smaller. I can guess that it's because of higher water potential in potato cylinder than in solution (water was diffusing from potato to solution). * We didn't stir any of the solutions.

  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. Osmosis in potato

    The mass of the potato is a variable I will measure through the experiment. Controlling variables Materials: a large potato Cork borer 3 small beakers Distilled water (H2O) Salt (sodium chloride) Ruler Timer Graduated cylinder Pencil Chipper Weight scale Designing method With graduated cylinder I fill each of the beakers

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

    of potato strips with the following dimensions: (0.5cm x 0.5cm x 4.0cm) 6 beakers of size 50ml Knife Ruler ( measuring up to 15cm) 6 different sugar (sucrose) solute concentrations : 0.0 mol dm-3 ( distilled water ) 0.2mol dm-3 0.4 mol dm-3 0.6mol dm-3 0.8mol dm-3 1.0mol dm-3 The

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