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

Osmosis Investigation.

Extracts from this document...


Osmosis Investigation. Introduction Osmosis is the movement of water, from a higher concentration of water to a lower concentration of water through a semi-permeable membrane. Osmosis is a form of diffusion that takes place when two solutions or concentrations are separated by a semi permeable membrane. The membrane stops large dissolved molecules from passing through, but allows the passage of water molecules pass through the membrane until both of the solutions are the equal strengths. If water moves out of the cell faster than it enters it will become flaccid, if the water moves out of the cell slower than it enters it will become turgid. Applying external pressure to the solution on the more concentrated side arrests osmosis, and is a measure of the osmotic pressure of the solution. Fish have protective mechanisms to counteract osmosis, which would otherwise cause fluid transport between the body of the animal and the surrounding water (outwards in saltwater fish, inwards in freshwater ones). ...read more.


Then we weighed them to see if our prediction had come true or not. To make the test as fair as possible we kept, weight of potato, volume of water and length of time the potato spent in the water equal to avoid any cheating. Anomalous Result RESULTS Our results had matched our prediction with the weight increasing due to osmosis. The results show that the more the surface area the potato had the heavier the potato became. So you can clearly see that water has a higher concentration than the potato and that is why the potato gained weight. As you can see there were some anomylous results with the eigths. For some reason the eigths did not gain even more weight with the increased surface area, and also the first test had more weight than the next two tests To resolve this I would havereapeated the test to see if I could change them to suit the graph. ...read more.


We could resolve this by timing the amount of time each potato had to dry (e.g 1 min). We could have left the potatoes in the water for longer than ten minutes (which was our stated time). We could have doubled the time to see if the potato weight would have doubled. Also to suggest a variable, we could have changed the temperature of the water which the potato's were in. This would show whether the water temperture affected the results, for this I would expect the transportation to be quicker in hotter temperature's. his is because the water molecules will have gained more energy when heated, so they move around quicker, resulting in a faster reaction taking place. Overall I think that the experiment was a success even though it had an anomalous result, which did differ the result from my prediction, but still my main thought of that the rate of osmosis would increase with a bigger surface area was true. ...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
  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work