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

An investigation into the effect on Osmosis by varying the concentration of water

Extracts from this document...


An investigation into the effect on Osmosis by varying the concentration of water Aim: An investigation into finding out how changing the concentration of the sucrose solution effects Osmosis. Hypothesis: I predict that the less the concentration of sugar is, the greater the mass of the potato will get. This is because Osmosis is the movement of water from a high concentration to a lower concentration, through a partially permeable membrane. And with there being a small concentration of sugar in the solution and a large concentration of water, the water would diffuse into the potato. And the greater the concentration of sugar gets, the smaller the mass of the potato will be. This is because the potato will have a higher concentration of water than the sugar solution, so the water diffuses from the potato into the sugar solution. Apparatus: -Beaker -18 Boiling tubes - Bungs -Salt -Water -Electric Balance -Scalpel -Potato -Cork bore -measuring cylinder Diagram: Variables: Dependent Variables- The dependent variable would be the percentage change in mass of the potato because with the different concentration solutions, osmosis happens differently. ...read more.


0 5 0 0.2 4 1 0.4 3 2 0.6 2 3 0.8 1 4 1 0 5 4. In the six boiling tubes, place a potato into each boiling tube. 5. Pour each different salt concentration into a boiling tube. Seal each boiling tube with a bung. 6. Leave the boiling tubes for 24 hours. 7. Remove the potatoes from the boiling cylinder one at a time and let each potato cylinder damp dry to get rid of extra water drops, and record the mass of each potato cylinder on the electrical balance. 8. Repeat this three more times, from step 1 and 3-10. Results: Molar concentration Initial mass of Potato cylinder (grams) Final Mass of Potato cylinder (grams) Difference in mass of Potato cylinder (grams) Percentage Change in mass of Potato (%) Average Percentage Change (%) Trial 1 2 3 Trial 1 2 3 Trial 1 2 3 Trial 1 2 3 0 0.90 0.78 0.86 1.06 .98 1.02 .16 .20 .16 17.78 25.64 18.60 20.67 0.2 0.71 0.76 0.82 .74 .83 .87 .03 ...read more.


As the molar concentration decreases, the greater the percentage change in mass becomes, this is because with the molar concentration decreasing, the water concentration increases having more water diffusing into the potato than out. From the graph you can see that with the molar concentration being 1, the percentage change in mass is the greatest, because the solution is packed with salt molecules and so much more water diffuses into the solution than into the potato. Evaluation The graph showed in the results is what I predicted would happen, so this suggests that the experiment was fairly accurate. The accuracy of the investigation was adequate, but when each potato was damp dried to get rid of excess water, each potato was not was not necessarily done the same, and they were dried a more accurate way it could improve the accuracy of the experiment. Doing three trails for each solution increased the accuracy, but for at least one trial in each concentration there was an anomalous result, that was that was over 5% greater. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. Marked by a teacher


    3 star(s)

    As the results show, in the water solution the potato chip actually gains mass after 15 minutes. This is because the water concentration inside the potato is lower than the water concentration in the water solution, hence the water in the solution will diffuse into the potato through its semi-permeable

  2. The effect of concentration of sucrose solution on the osmosis in potato

    * temperature (room temperature) Carry out the experiment in the laboratory under the same conditions. * volume of solutions (with difference concentration) Add 20 cm3 of 0%, 5%, 10%, 15% and 20% sucrose solution in each test tube. Each of the condition will be repeated five times.

  1. Isotonic Point of Potatoes

    Due to this error while creating the solutions, the concentration that the solution that was assumed could have been completely different thus giving anomalous and incoherent readings. The Standard Deviation values for all the data received are extremely low and thus indicate consistency within the results received from the experimentation.

  2. The effect on osmosis on the egg shell

    Materials PROCEDURE (per group) Figure 3. Electronic balance Note that eggs should be fresh, of the same type and taken from the same origin as it may influence results. Because the experiment is respectively long if we take into consideration available time at school, each group should carry out the same experiment, so that there would be enough measurement (in this case six).

  1. The effect of toliet cleaning products on E-coli ...

    However the positions within the two groups could change if the standard deviation was implicated. 3.0.0 Conclusion and evaluation 3.1.0- Conclusion The hypothesis "King White toilet cleaner will most adversely affect (kill)

  2. Egg Osmosis

    The difference between this two weights is 27.26g, that's mean the egg before the experiment is lighter. e) d5 - different between second and third weight: d5 = 88.80g - 88.63g d5 = 0.17g The difference between this two weights is 0.17g, that's mean the after the beaker with raspberry

  1. Environmental Mangement - Upland Burning in Ireland and the Effects of the Heritage Bill ...

    Wet heath habitats are generally comprised of a mosaic of damp, wet and dry habitats on shallow wet acidic peaty soils with a typically average depth of 15-50 cm. (Fossitt, 2000). HH3 habitats support a wide range of rare plants and animals, some of which are extremely reliant upon heathland for breeding and other lifecycle stages.

  2. Finding the isotonic point for potato tissue

    There is no net movement of water particles into/ out of the cells by osmosis. B : Between 0.3 M and 0.0 M the potato sticks gain mass as the sucrose solution became more dilute. The water particles entered the cells by osmosis from the more dilute sucrose solution to the more concentrated solution of the cell cytoplasm.

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