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

To find out which concentrations of sucrose solution cause water to be gained or lost by osmosis in potatoes.

Extracts from this document...

Introduction

INVESTIGATING OSMOSIS IN POTATO'S Aim: To find out which concentrations of sucrose solution cause water to be gained or lost by osmosis in potatoes. Background: The spontaneous passage or diffusion of water or other solvents through a semi permeable membrane (one that blocks the passage of dissolved substances--i.e. solutes). The process, important in biology, was first thoroughly studied in 1877 by a German plant physiologist, Wilhelm Pfeiffer. Earlier workers had made less accurate studies of leaky membranes (e.g., animal bladders) ...read more.

Middle

Increasing the pressure on the solution by a specific amount, called the osmotic pressure, can stop this process. The Dutch-born chemist Jacobus Henricus van't Hoff showed in 1886 that, if the solute is so dilute that its partial vapor pressure above the solution obeys Henry's law (i.e., is proportional to its concentration in the solution), then osmotic pressure varies with concentration and temperature approximately as it would if the solute were a gas occupying the same volume. ...read more.

Conclusion

Turgor is very important to plant cell's because it helps the plant's to be firm. We can use the kinetic theory to try and explain the factors affecting the rates of reactions. This is also known as the Collision The collision theory says that: Chemical reactions occur when particles of the reactants collide. They must collide with a certain minimum energy, called the activation energy The particles must collide with enough energy (activation energy) otherwise they will. Just bounce off each other harmlessly. The activation energy is needed to break the bounds in the particles and get the reaction started. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction 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 AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Osmosis. Aim: To find the molarity of potato tubers cell sap. BIOLOGICAL ...

    4 star(s)

    Diagrams of my method Results obtained for Mass Concentrations Initial Mass (g) Average (g) Final Mass (g) Average (g) Difference (g) Change (%) 1 Molar 1.85 1.86 1.57 1.43 -0.43 -23.12 1.86 1.42 1.86 1.25 1.86 1.46 0.75 Molar 1.86 1.87 1.56 1.54 -0.33 -17.65 1.87 1.51 1.87 1.51 1.87

  2. Investigation on Osmosis using a potato.

    This is because the isotonic region is obviously going to be very close to the regions where the potato is going to lose weight and where the potato is going to gain weight but in both cases the potato will have very little change in mass.

  1. permeability of beetroot membranes

    We then placed a different group of potato discs into different test tubes. Each of these test tubes contained 15 millilitres of glucose solution of different concentrations. These concentrations increased by 0.25 moles/dm3 each time, starting at 0.00 M (distilled water).

  2. Investigating Water Potential Of Potatoes.

    (Pg. 49, Biology a Functional Approach, MBV Roberts). Osmosis is a special case of diffusion: it involves the passage of water molecules from a region of high water potential (the beaker) to a region of lower water potential (funnel). It is the presence of sugar molecules in the funnel, which makes the concentration of water molecules lower on that side of the membrane.

  1. Osmosis In Potatoes.

    We tried 0.2 molar concentration (the lowest) and 10 molar (the highest.) We then left each test for 5 minutes, but found after that time no reaction had taken place. It was then we predicted we would have to leave the tests for at least triple that time.

  2. Osmosis in potatoes.

    is bigger it can take in more solution and therefore can show more of a change then a small chip that wouldn't be able to take in as much solution and not show as much difference. o Time in the solution - the longer the time in the solution the

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