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

Potato and Sweet Potato Water Potential in Different Sugar Solutions

Extracts from this document...

Introduction

Potato and Sweet Potato Water Potential in Different Sugar Solutions Introduction: Osmosis is when water moves from an area of high concentration to an area of low concentration through a semi permeable membrane. With the experiment being conducted the semi permeable membrane in use would be the potato or sweet potato. When one looks at water potential one can deal with whether a particular solution would gain or loose water molecules from another solution. Research Question: How does the weight of different potato or sweet potato pieces change when placed in a particular sugar solution? Hypothesis: As the concentration of the sugar solution increases the weight of the potato and sweet potato will decrease. It will take a higher sugar concentration to make sweet potatoes loose weight as they are already high in sugar concentration as compared to a potato. ...read more.

Middle

3g - Place one piece into each of the 5 labeled test tubes - Leave the test tubes in a room for 20 hours undisturbed - Return after the 20 hour gap and remove the potatoes out of the test tube and place on the weighing scale and take their weight. - Once finished repeat the same thing for the sweet potato. Data and Findings Type of Potato & Concentration of Solution [M] Initial Weight (Grams) Final Weight (Grams) Weight Difference Potato in the Solution Texture of potato after 20 hours Potato 0.0 3.0 3.3 0.3. Piece sinks to the bottom of the test tube Normal Firm Potato Texture Potato .25 3.0 3.53 0.53 Piece floats in the middle of the solution Less Firm Texture Potato .50 3.0 2.98 -0.02 Piece floats in the middle of the solution Soft Texture Potato .75 3.0 2.83 -0.17 Piece is almost afloat on top ...read more.

Conclusion

The reason for this occurrence is due to osmosis occurring between the vegetables and the sugar concentrations. Hence, potatoes gaining the most weight in distilled water whereas they would loose their weight in the highly concentrated sugar solutions. The texture of the vegetables change as well due to process of osmosis over the 20 hour period due to the swelling up of cells which makes the potato firm. Whereas, when the sugar concentration is increased the water concentration in the solution along with the potato is decreased which leads to the potato forming a smoother softer texture. Errors and Uncertainties: - When one left the sugar solution out for 20 hours ants got into the sugar solution which could have affected the experiment. - Timing could have been kept more accurate as no one was aware of when each potato was put into an individual test tube. - Better manipulative skills. - Checking the weighing scales properly as they could be inaccurate. ...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

    However, the standard deviation could have arisen if the experiment has not been carry out in a suitable method or the process of the experiment has not been follow correctly. The graph has been drawing off best fit when the result of 15% sucrose solution has been excluded.

  2. Testing the solute concentration of potato cells

    Error bars are also small because they are based on low standard deviation. These lead to high precision for this data. Evaluation Still these experiments involve a number of sources of errors. Human errors are always present as they can not be reduced to zero.

  1. Biology- Extended essay. For this research, I investigated the effects of DDT and ...

    First minute Second minute Third minute Fourth minute Fifth minute CONTROL A 150 142 146 148 149 147 3.16 B 149 145 149 146 148 147.4 1.82 C 149 149 146 148 146 147.6 147.08 1.52 4.59 D 146 147 144 149 146 146.4 1.82 E 148 149 147 146

  2. Isotonic Point of Potatoes

    However, to acknowledge anomalous data, as seen in Graph 2, an unusual trend appears. There is a sudden increase in the change in length of the potatoes in the 0.15 M solution. This is against the expected and regular pattern of data.

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

    (2006, McGraw-Hill Higher Education) Effect of Salinity on Potato Cells High salinity causes plants to lose water through osmosis. (November 2009, Wikibooks)A potato is a plant meaning that it is made up of plant cells. A plant cell has a strong cell wall keeping the shape of the plant rigid.

  2. investigating the water potential of potato cells

    the potato's cells, so that the mass of potato tissues will increase. Vice versa, if the sucrose concentration is higher than the potato's cells, the mass of potato tissues will decrease because the water molecules in the potato cells will move outside of the cells to the concentration and the particles in the solution will move to the potato's cells.

  1. Biology report:water potential

    and vegetables contain both starch and sucrose, though inequally distributed (13.49g of starch per 100g of tissue as opposed to 0.28g sucrose per 100g of tissue), we can presume that, if subjected to different sucrose concentration solutions, the potato would require a smaller concentration of sucrose to achieve an isotonic state, i.e.

  2. Finding the isotonic point for potato tissue

    the cell, the water particles diffuse out of the vacuole of the cell. The vacuole then shrinks pulling the cytoplasm away from the cell wall but the mass of the cell stays the same. This process is called plasmolysis. 1.

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