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

To investigate how the concentration of a sucrose solution affects the length of a potato chip. The length will be measured after 24 hours.

Extracts from this document...


Osmosis Investigation Aim: To investigate how the concentration of a sucrose solution affects the length of a potato chip. The length will be measured after 24 hours. Prediction: In this particular experiment, I think the lower the concentration of the sucrose in the test tube the greater the length of the potato, because of the potato tissues being surrounded by a weak solution, will be most likely to swell up and become turgid, taking in all the water it can possibly take in. However this can work vice versa, because as you increase the sucrose concentration then the potato length will decrease, this is due to the potato tissues being surrounded by a stronger solution therefore the water diffusing out of the potato into the solution. I have predicted this following a scientific theory. This theory is the movement theory, which states that movement of water (H20) from a dilute solution to a concentrated solution, through a semi-permeable membrane. Osmosis is defined as the net movement of water or any other solution's molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. ...read more.


If this experiment isn't a fair test, we will be obtaining the wrong results, which could lead us to the wrong conclusions. First of all, and most importantly, we will have to get the measurements of the potatoes and the measurements of the solutions right. We will try and get the measurements of the potatoes as accurate as possible for every single potato, evenly cutting the potato pieces 2cm per piece. But I believe one of the most important steps in the fair testing is to make sure that the potato is fully covered by the solution. This is because the potato should fully submerge, by having total contact with the solution. Getting and experimenting with the exact measurements of molars and water is vital to this task. If the volume of one solution in a test tube is higher or lower than another, will affect the pattern of results later on. Small things such as a dirty test tube, and a slightly cracked measuring cylinder could still affect the results, and therefore we will take these into account as well. I couldn't repeat this exercise due to not having enough time but I made sure that I compared my results with other groups doing this experiment so I could get a wider view of the out comings. ...read more.


A problem with my method could be that I didn't repeat the exercise enough times to get more reliable results. I think that my observations and measurements were not the best because I was underneath a certain time limit to get the experiment done, the variations in length would have been at maximum 2mm. There were four anomalous results that didn't go through the line this was due to me not cutting the potatoes to the exact size. Also because all the potatoes were not of the same mass. To make this experiment better, I believe that we could have done one test at a time. Using more types of molar sucrose solutions would have helped us obtain better results, and more accurate results, so that we can make sure the results are totally correct. Experimenting with one set for a longer period of time, for each set, would lead us to better results, because the osmosis action would reach its maximum capability, and therefore tell us how much water could be transferred for each solution. I could have extended my investigation by doing more research on osmosis and by spending more time on the actual experiment. Overall I was pleased that my prediction was right although getting a few anomalous results due to human fault, however my results still supported my prediction and I came to my conclusion. ...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)

    Next, I will place 4 strips in each Petri dish and label the covers of the dishes for the concentrations. I will then pour the corresponding solutions in the Petri dishes and see that the strips are submerged and close it immediately.

  2. Investigating Water Potential Of Potatoes.

    This can only be done by diluting (or adding more water) to the solution inside the cell vacuole. Due to it having to take in water the cell becomes turgid. (Pg. 49, Biology a Functional Approach, MBV Roberts). (Mastering biology, OFG Kilgour, Pg.

  1. Investigation on Osmosis using a potato.

    am predicting that the weight of the potato in this experiment should be increase by about, just less then a tenth or so. The 0.6 molar solution of sucrose, I think, should make a little difference now, there should be little difference between the two concentration gradients and therefore the

  2. Osmosis In Potatoes.

    one chip didn't have a longer amount of time in the solution than another. We then left each one for 30 minutes. After 30 minutes, we emptied each test tube, leaving only the potato chips inside. Before we measured and weighed each chip, we dabbed them with paper towel.

  1. The problem of rising deaths due to Malaria in Mumbai, India

    protected, but they act as bait to the mosquitoes who then land on the net and are killed. In this way the population of mosquitoes is reduced, thus reducing infection rate. Insecticide treated nets can avert around 50% of malaria cases and reduce all-cause child mortality by approximately 18 percent.

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

    This causes the rate of diffusion to also increase. The relationship is proportional because an increase in temperature will then cause an equal increase in the rate. However the rate can only increase so much because there are a limiting number of intrinsic proteins that the pigment can get through.

  1. effects of concentrations of sugar solutions on potato chip cells

    At this point osmosis stops. I carried out some preliminary work to help me with my plan. I tried using a boiling tube to hold my chips and solution in, using 20ml of solution in total. I used an accurate 25ml-measuring cylinder, which I could keep to the nearest ml.

  2. This experiment aims to investigate the effects of 4 different types of fish food ...

    faster than those fed on Aquarian Flakes � Fry fed on Freeze Dried Brine Shrimp would grow no faster than those fed on Natural Foods � Fry fed on TetraPrima would grow no faster than those fed on Freeze Dried Brine Shrimp � Fry fed on TetraPrima would grow no

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