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

GCSE Biology Osmosis Coursework

Extracts from this document...


GCSE Biology Osmosis Coursework Introduction Osmosis is the movement of water molecules from a week solution to a strong solution through a semi-permeable membrane. The key factors of osmosis are concentration, surface area and temperature. In my experiments I will be changing the concentration of the water. Aim To investigate what speeds up the rate of Osmosis. Preliminary Work In my preliminary tests I started by setting up the apparatus as in the diagram above, then I started to gather results from the preliminary experiments. Concentration (M) Mass before (g) Mass after (g) 0.0 pure water 0.67 0.74 0.25 0.8 0.87 0.5 0.7 0.84 1.0 1.08 1.09 From these results I will make up a method that will show better results in my experiment. I have also decided that I will use smaller concentrations in my experiment and will do each test twice, this is so that I have a better chance of good results. Planning Method For my experiment I will need to cut a bit of potato into near equal sized chips with a near equal mass, and then I will put ...read more.


Whereas when the concentration is in the middle strength region, 0.3, 0.4, then the chips will start to keep the same weight because the sucrose concentration will star to equal out. Also I think that when the concentration is high, 0.5, the chips will start to loose weight because the sucrose concentration will be higher out side of the chip. I think that the texture and strength of the chips will change as well; I think that when the concentration is low that the chips will stay strong or get stronger due to gaining mass, then when the concentration is In the middle then the chips will get softer and when the chip is in high concentration the chip will be soft and flexible. I think that when the concentration is the lowest then the speed of osmosis will be at its fastest because the concentration outside the chip will be weaker than inside the chip allowing osmosis to be quicker. Obtaining Evidence Results 1 2 3 4 5 6 Concentration (M) ...read more.


Osmosis occurred fastest in the 0.1 Molar sucrose solution, this happened because the solution was quite week allowing it to pass through a semi-permeable membrane in the chip due to the high concentrated solution inside the chip. Evaluation By doing this experiment I was able to show the effect of concentration of sucrose on the speed of osmosis, this is shown in my results. Most of my results are as accurate as I think I could have got them, however there are a couple of results on the mass after where the mass after drops bellow the mass before at a weak concentration. These anomalies where probably caused by an increase in temperature or a slightly stronger solution than with the other results. If I did the experiment again then I would do each concentration more than twice, probably three or four times each, this would give me a much more accurate set of results because I would get a much more accurate average and I would have enough results to ignore any anomalies. ...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

    Sand Dune Succession Coursework

    5 star(s)

    The decomposers in the soil, anaerobic and aerobic bacteria and fungi, increase the level of ammonium ions in the soil which is absorbed by the roots of plants. Ammonium compounds produce nitrates and nitrates which are also absorbed by plants.

  2. Marked by a teacher

    Biology coursework planning - the effect of lead chloride on the growth of cress ...

    5 star(s)

    * After 7 days, measure the length of the shoot (starting from the seed and not including the root) of each cress seed in all three petri dishes. This is done using a ruler. The results of the experiment are shown below.

  1. Investigation on Osmosis using a potato.

    27 3 -9.420289855% 1.34 1.19 30 0 -11.19402985% These results again show a strong negative correlation, we can see this just because there is a pattern which is from a high positive number then it leads down to a negative number in the percentage change column, which is how we tell that it is a negative correlation.

  2. AS biology coursework on enzymes

    of starch and distilled water to make it a blue/black colour and then once my amylase has been added I will start the stopwatch and wait for a colourless solution. I will know that a clear solution has appeared because I would have drawn a black cross on a white tile and held it up against the solution.

  1. Potato coursework

    This stops more water entering and also stops the cell from bursting. When a plant cell is full with water it is called turgid. Also in plant cells, when it is placed in a hypertonic solution, the cell will loose water.

  2. Design an experiment to investigate the effect of temperature on the movement of a ...

    Size of beetroot I am going to control the size of the beetroot by using a cork borer to bore a cylindrical slice through the beetroot, then I am going to cut off 10mm slices from both of the edges, because the edges might not have as much pigment in as the middle of the beetroot.

  1. Finding out the affect of different concentrations of sucrose solution on the mass of ...

    I set up 3 specimen tubes-2 containing the 2 different sucrose solutions and one with just air. I then put one potato chip in each of the filled specimen tubes. The third chip is put a specimen tube filled with air.

  2. Evolution and Biodiversity - Edexcel GCE Biology Revision Notes

    based on their similarities and differences, making it easier for scientists to identify and study them. There are seven levels and groups (called taxonomic groups) used in classification: Kingdom, Phylum, Class, Order, Family, Genus, Species Similar organisms are sorted into five Kingdoms and similar organisms from that kingdom would be grouped into phylum.

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