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

Investigate if osmosis occurs in potatoes and whether varying the concentration of sucrose solution affects the water/mass gain or loss in the potato chips when kept in a constant environment.

Extracts from this document...


2/0 To se 6/03e how varying the concentration of Sucrose solution affects the water Gain or loses on a potato Chip during osmosis. Aim To investigate if osmosis occurs in potatoes and whether varying the concentration of sucrose solution affects the water/mass gain or loss in the potato chips when kept in a constant environment. Equipment * 5 same volume test tubes: to hold sucrose solution and potato chips. * 2M, 1M and 0.5 M sucrose solution (15ml) * Distilled water: as a control to all the other experiments ( to compare the pure water to the sucrose solutions) * Test tube rack: to hold test tubes. * Measuring cylinder (15ml): to measure sucrose solution) * 5 small pieces of potato (0.7*0.7*3.1 cm) * Knife: to cut potato into size. * Pipette: to transfer sucrose solution from container to test tube. * Mass balance: to measure mass of potato chips at beginning and end of experiment. * Timer: to time the experiment making sure each potato chip receives the same amount of time in the test tube. * Tissue paper: to dry the potato after osmosis has taken place- so it is a fair test. * Cutting tile: to cut the potato safely not damaging the lab tables. ...read more.


* Make the 5 potato chips from the same potato as different potatoes may have a different permeable membrane or one that is different to the others. * Do the experiment at room temperature. * Keep the water content in the potato the same by using chips from the same potato and by not washing or exposing them to water. * Use the same mass balance as some balances may have worn out over time making them read masses incorrectly or different manufactures of balances may measure the sizes of the units differently making measurement slightly different between scales. Safety Precautions * I will take care using the knife as it is very sharp and is designed to be used to cut hard substances such as potatoes, which will easily pierce my skin or other students around me. * I shall also take care when handling the solutions as they may get in to our bodies internally and as we are not aware of the capability of the solution and what harm it can do to us. Scientific Knowledge Osmosis is the movement of water particles from a higher concentration to a lower concentration across a partially permeable membrane. A partially permeable membrane is just a membrane with tiny holes in them that only allow small enough particles to pass through them. ...read more.


As there is a higher concentration of water in the solution and a lower concentration in the potato then due to osmosis water will enter the potato and cause a mass increase. If my prediction is true then the graph that I will draw from my results will look like this rough one: Time (minutes) See Key on next page Key Solution with low concentration of sucrose, Solution with high concentration of sucrose This graph gives us the basic idea of how osmosis in the potato should occur. The solution with a low concentration of sucrose must have a high concentration of water so consequently percentage mass change should be positive and an increase. Whereas the solution with a high concentration of sucrose must have a low water concentration, so water will pass from the potato to the low concentration of water making water content balance. This will then cause the percentage mass change to decrease as shown by the red line of the graph. Taking into consideration, we did a preliminary test of the experiment to see whether we could improve the final run. We can see from the preliminary results in the Results section that the prediction was fairly accurate and supported the scientific knowledge, although we learnt from the preliminary work that we should use smaller sized potato chips as the got stuck in the test tube. ...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

    To investigate how varying the concentration of sucrose solutions affects the rate of osmosis ...

    3 star(s)

    I recorded the readings for each potato cylinder. I then repeated the same procedure for the potato cylinders in the Petri dish marked "Distilled Water". Precautions: To ensure that my test was a safe and fair one I took the following precautions: 1.

  2. An experiment to investigate the effects of sucrose solution on Osmosis in potatoes chips.

    Same size test tube * Same size potato bore Safety: To ensure safety, the boiling tubes will be kept in beakers so that they can not be knocked over. The potato chips will be cut on a white tile with a scalpel so that no one will be cut.

  1. Osmosis. Aim ...

    The way I did this is shown through the table below. Percentage of Molar Solution (%) Amount of salt Concentration (ml) Amount of water (ml) 100 20 0 80 16 4 60 12 8 40 8 12 20 4 16 I have chosen to go up in concentration of the

  2. Osmotic pressure

    In B the loss of water from the vacuole by osmosis causes a decrease in cell volume and withdrawal of the cell surface membrane from the cell wall. This is referred to as plasmolysis. Aim: My aim is to investigate and find out the value of water potential inside of a potato using different concentrations of sucrose solution.

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

    (To allow us to make our own). Solutions of varying strengths (of sucrose and NaCl), or a solution of a known strength and distilled water. (To allow us to make our own). Pins (To ensure that cylinders remain separate while in the solutions.) Test-tubes Callipers (To measure cylinder height and diameter.)

  2. How Osmosis affects Potato chips in different concentrations.

    these other factors like I mentioned below: The main factors which will need to be considered whilst doing the experiment are: * Temperature of water: Doing the tests at one fixed temperature will control the temperature of the water. For the purpose of my experiment I am going to do all the experiments at room temperature.

  1. Potato Chips

    The larger the surface area the faster osmosis takes place. This is because it creates more space for diffusion to take place. To use a potato corer to core all the chips and to accurately measure the lengths of the chips to 30mm Duration of experiment i.e.

  2. To find out the net movement of water when potato chips are put in ...

    The more solute, the more negative (lower) the water potential becomes. The amount that the solute molecules lower the water potential of a solution is called solute potential, therefore solute potential is always negative, its symbol is q[s].

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