• 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...


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.


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.


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

    Investigate the water potential of celeriac.

    5 star(s)

    My average results show that this occurs. When the discs are placed in a 0.0 mol dm-3 sucrose solution, the celeriac cells gain 19.3% of their original mass. In conclusion, I have completed the aim of my experiment: to investigate the water potential of celeriac. I found this to be -1700 kPa.

  2. Marked by a teacher

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

    4 star(s)

    I will do this by adding the right amount glucose in 1 litre of water. I will then wash the Petri dishes and dry them. Then using a No. 5 cork borer, I will cut out 20 potato strips. To do this, I will place a potato on a board and push the borer into it.

  1. Investigating Water Potential Of Potatoes.

    This is because the cell will want to lose water in order to correct the concentration gradient, in and out of the cell. The opposite will happen if the potato is placed in a solution where the concentration outside is hypotonic compered to that inside the cell.

  2. Investigation on Osmosis using a potato.

    Now we will take down the readings of mass of each potato cylinder we will do this to the nearest hundredth gram. After this is done then enter the potato cylinders into the allocated test tubes which will avoid any confusion in mixing up the test tubes.

  1. Osmosis In Potatoes.

    However, in the middle of the scale, say 0.2 molar concentration; the graph will go right down, due to the fact that the solution will be isotonic to the potato. In other words, the solution and potato chip are about equal in concentration.

  2. permeability of beetroot membranes

    We separately weighed each of these groups on filter paper so before weighing them together we found the weights of each piece of filter paper then subtracted that from the weight of the filter paper and 4 disks of potato together to find the weight of the potato disks.

  1. Osmosis in potatoes.

    o Mass - the mass is the easiest thing to change but the hardest thing to make the same so it will differ even if all the chips are the same size. For this experiment I will be changing the concentration of sucrose to find out roughly what concentration is inside the cells.

  2. In this Sc-1 experiment, we are going to put potato chips into different concentrations ...

    The potato skin will be cut off since it may be permeable to water, therefore may affect my experiment. The chips will then be piled up in line on top of each other. This is to check whether the shapes of the chips are the same as the others.

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