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

Osmosis. To investigate which sucrose concentration is the same as the concentration of cell sap inside the potato by narrowing down the primarily larger ranged concentrations of the cell sap

Extracts from this document...

Introduction

Science Coursework: Osmosis Aim: To investigate which sucrose concentration is the same as the concentration of cell sap inside the potato by narrowing down the primarily larger ranged concentrations of the cell sap. We will do this testing an extensive variety of sucrose concentrations to discover the concentration that gives the smallest mass change in the potato. Intro: Osmosis is the diffusion of a liquid, although it is often assumed to be water; it can be any liquid solvent through a selectively permeable membrane from a region of low solvent potential to a region of high solvent potential. The selectively permeable membrane must be permeable to the solvent, but not to the solute, resulting in a pressure gradient across the membrane. See below: The image is showing us that because there is a lot more water in the cell to the left and very little in the cell to the right, the water is travelling from the region of higher water concentration i.e. the cell to the left to the region of lower water concentration i.e. the cell to the right. As we can see in the image (right), only the water molecules are actually moving. http://www.himalayancrystalsalt.com Turgor pressure is the positive internal pressure in a cell resulting from osmotic pressure i.e. the cells expanding and be in danger of bursting, water pushing outwards from inside the cell because they contain too much water in a certain amount of space divided by a selectively permeable membrane. ...read more.

Middle

with exactly the same equipment. Equipment: * Five different concentrations of Sucrose solution: 12%, 14%, 16%, 18% and 20%. * 2-3 Potatoes * 6 Boiling Tubes * 1 Boiling Tube rack * 1 Measuring Cylinder * 1 Graduated Pipette * Top Pan Balance measuring to 2dp * 1 Size 6 Cork Borer * Ceramic Cutting Tile * Small Cutting Knife (scalpel) Safety: Scalpel: Be careful not to whirl around the scalpel as it could cause serious damage to yourself or people around you. Boiling Tubes: Again be careful not to swing around boiling tubes as you could drop and break them creating serious hazard. Also hold boiling tubes firmly because if your grip is weak, the boiling tube can again fall out of your hand and break. Cutting tile: Do not throw these around as their edges are quite sharp and can cause serious harm to the people around you. Method: 1. Cut six equally sized potato chips using the same cork borer. 2. Measure the mass of each potato chip using a top pan balance to two decimal places. 3. Measure and pour 25cm3 of sucrose solution into 6 boiling tubes. The five boiling tubes will contain these six concentrations of sucrose solutions: 12, 14, 16, 18 and 20 %. Sucrose Concentration (%) Starting Mass of Potato Chip (g) Average Final Mass of Potato Chip (g) Average Change in Mass of Potato Chip (g) ...read more.

Conclusion

Lastly we have repeated this experiment three times to increase reliability. Repetition of the experiment helped us make the results more reliable because if there were any anomalous results we would be able to spot them easily by looking at the three sets of results and noting down the major differences. Preliminary Work Preliminary Equipment: Five different concentrations of Sucrose solution: 10, 20, 30, 40 and 50%. * 2-3 Potatoes * 6 Boiling Tubes * 1 Boiling Tube rack * 1 Measuring cylinder * Top Pan Balance measuring to 2dp * 1 Size 6 Cork Borer * Ceramic Cutting Tile * Small Cutting Knife (scalpel) Preliminary Method: 1. Cut six equally sized potato chips using the same cork borer. 2. Measure the mass of each potato chip using a top pan balance to two decimal places. 3. Measure and pour 25cm3 of sucrose solution into 6 boiling tubes. The six boiling tubes will contain these six concentrations of sucrose solutions: 0% i.e. pure/distilled water, 10, 20, 30, 40, 50%. Preliminary Results: We discovered the following results after conducting this experiment. Sucrose Concentration (%) Starting Mass of potato chip (g) Final Mass of potato chip (g) Change in mass (g) Increase or decrease in mass 0 1.00 1.43 0.43 Increase (+) 10 1.00 1.23 0.23 Increase (+) 20 1.00 0.82 -0.18 Decrease (-) 30 1.00 0.71 -0.29 Decrease (-) 40 1.00 0.60 - 0.40 Decrease (-) 50 1.00 0.44 -0.56 Decrease (-) ?? ?? ?? ?? John Smith Yr.11/Sc1 Page 1 of 9 Miss Pittaway ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Life Processes & Cells 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 GCSE Life Processes & Cells essays

  1. Marked by a teacher

    Investigating the effect of Sucrose Concentration on the Rate of Osmosis in Potato Chips.

    5 star(s)

    change in mass for varied concentrations of sucrose concentration in the 1st and 2nd sets of experiments, they show a trend. The results show that when the sucrose concentration is low and the water concentration is higher outside the potato cells, the mass of the potato chip, after an hour increases.

  2. Osmosis. An experiment to find the concentrations of salt solution which is the ...

    Now, weigh each core using an electronic weighing scale, and record each mass in a table. 4. Then, obtain a test tube rack, followed by six test tubes. 5. Next, using a syringe, measure out the correct volume of different concentrations of salt solution, and put in the six test tubes.

  1. Find the concentration of Potato Cell Sap.

    -Number of pieces of potato per concentration; I only used 1 piece of potato per concentration last time, which meant I was unable to find an average. 3 or more per concentration is in fact needed in order to find an average.

  2. To determine the concentration of the cell sap in potato storage tissue. By using ...

    inside the potato, water would move into the potato making it larger. By monitoring the size of the potato we can determine what solution had the higher concentration. If no change is made then the concentration of the solution outside the potato is identical to the concentration of the solution inside the potato.

  1. Osmosis, What is the effect of sucrose concentration on the rate of osmosis in ...

    Surface Area: The surface area of the potato piece affects the amount of sucrose surrounding the potato. The larger this surface area is, the faster the rate of osmosis occurs. I will control this variable by making all of the potato pieces have the same surface area.

  2. To find out the concentration of cell sap

    representative this could be because the experiment wasn't ran for long enough or the range of molarity wasn't big enough. Considering the information gathered from the preliminary work I am going to do the following for the initial experiment: 1.

  1. What is the concentration of the cell sap in the vacuoles of potato cells?

    PRELIMINARY INVESTIGATIONS: Before I started the investigation I had to do some preliminary investigations so that I could understand the topic more fully and to assist in planning an appropriate experiment. 1. The Raisin Experiment - I put one raisin in a beaker of water after having weighed it.

  2. Osmosis is defined as 'the movement of water molecules from an area of high ...

    This is another reason to use cloned potatoes. My results were consistent, and there were no results that they were ignore . I could extend my enquiry by testing the percentage change in mass with morality using a different substance. By this I mean using a different vegetable, perhaps celery or cucumber.

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