• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7

# Find out the concentration of sucrose solution that is equivalent to the osmotic potential of Potato tuber cells.

Extracts from this document...

Introduction

Osmosis Investigation By Christopher Stylianou Aim The aim is to find out the concentration of sucrose solution that is equivalent to the osmotic potential of Potato tuber cells. Factors All the independent variables, which could affect the investigation of Osmosis, are: > Mass- By changing the size of the cell could change the amount Osmosis occurring. > Concentration of Solution- By changing the concentration of the solution surrounding the cell could change the amount of Osmosis occurring. > Temperature- By changing the temperature of the solution or cell could change the amount of Osmosis occurring. > Size- By changing the surface area of the cell could change the amount of Osmosis occurring. Investigation I have decided with the research I have below to investigate the Concentration of the Sucrose Solution independent variable. This is because I can use a scale of 10 different solutions. E.g.: - 1 Molar of Sucrose Solution to Water or 0 Molar of Sucrose Solution to Water. Then I can work out how much each cell has gained or lost by weighing them and then see which is the nearest Potato tuber cell not to change it's concentration from the beginning will be the right concentration of sucrose solution to equal the concentration inside the Potato tuber cell. ...read more.

Middle

Water (cm�) 1 Molar 30 0 0.9 Molar 27 3 0.8 Molar 24 6 0.7 Molar 21 9 0.6 Molar 18 12 0.5 Molar 15 15 0.4 Molar 12 18 0.3 Molar 9 21 0.2 Molar 6 24 0.1 Molar 3 27 0 Molar 0 30 Mix the solutions using a glass rod. Then take 11 of the potato tuber cells (potato cubes) and place 1 into each beaker. Then set the timer on and leave for 24 hours. Repeat this again to get two sets of results. After 24 hours, take each potato tuber cells out of their beakers and wipe off any excess solution. Then weigh each cell again and record this into your results. Then work out how much weight the cell has gained or lost in each solution by subtracting the starting weight by the finishing weight. Fair Test: - To make it a fair test you must carry out these precautions: - * The measuring and the Sucrose and Water are accurate by using a measuring cylinder. * Don't use the same measuring cylinder for the Sucrose and the Water because it might contaminate the solutions and make it an un-accurate and un-fair test. * Make sure that each potato tuber cell is 1cm� and doesn't have excess liquids on them. ...read more.

Conclusion

Also, the temperature, mass or/and surface area of the potato tuber cell could have changed which would affect the results. I think my method is good because you can get accurate results by using simple apparatus and knowledge. But it could improve my method by controlling the other factors better by making sure that the potato didn't have any kind of excess liquids on it, the mass was the same weight every time and the surface area was the same size every time. I could only do this with special equipment that wasn't provided for this experiment. Also, if we put the experiment in a controlled temperature environment, this wouldn't affect the results either. I had preliminary work to help me with the investigation, which was very useful in making my prediction. But now I have done the experiment, I could concentrate around the 0.3 - 0.4 Molar Sucrose Solution and go up in hundredths instead of tenths to get a more precise result. I could do another experiment which the same method but instead of using sucrose, I could use a different mineral to see if it will affect the results in anyway. E.g.: - Starch. I got my research from the Biology GCSE textbook and from the Internet- http://www.purchon.com/biology/osmosis.htm ...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

# Related AS and A Level Exchange, Transport & Reproduction essays

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

4 star(s)

Large molecules stay in one side. Small, fit molecules are only allowed to travel across. So as the size of the solute molecules increases the rate of osmosis decreases as they will take more time to travel across the semi-permeable membrane. Thickness of the surface: When the partially permeable membrane is thick, the water molecules have to travel longer distances across the semi-permeable membrane.

2. ## The Effect Of Temperature On The Permeability Of The Cell Membrane

3 star(s)

The disulphide, hydrogen bonds, peptide bonds all get disrupted and so more pigment diffuses from the vacuole of the membrane. High temperatures can disrupt the active site of the carrier which affects the shape of the fluid mosaic model membrane, I predict as the temperature increases from 0 to 40degrees

1. ## Water Potential of Potato Tuber Cells: The Density Method

Results Table Showing the Movement and Observations of the Drop for each Concentration Concentration (mol dm-3) 0.10 0.15 0.2 0.25 0.3 0.5 1 Movement and Observation of Drop Rise - remains quite close to solution surface. Rise - remains close to solution surface.

2. ## Osmosis in Potato cells

0.00 0.00 Candice 10% Sucrose 4.44 4.23 -0.21 -4.73 55.00 52.00 3.00 5.45 Candice 15% Sucrose 4.59 3.79 -0.80 -17.73 55.00 51.00 4.00 7.27 Candice 20% Sucrose 4.68 3.95 -0.73 -15.60 55.00 50.00 5.00 9.09 Melanie 100% water 4.34 4.48 0.14 3.23 50.00 54.00 -4.00 -8.00 Melanie 5% Sucrose 4.22

1. ## Investigating osmosis on swede cells.

in solution * 18 boiling tubes- To hold one swede chip in each tube with different concentrations * 2 boiling tube racks- To hold the boiling tubes * Distilled water- To mix solutions to desired concentration * 1 molar sucrose solution- To mix sucrose solutions to the desired concentration *

2. ## Investigation on Osmosis using a potato.

This is because the potato should fully submerge, by having total contact with the solution. To tackle this I found in my preliminary experiment that if you put the solution in first before the potato then the potato will float and will not be fully submerged.

1. ## Find the water potential of potato cells.

I will also dry each chip before weighing after being in a solution, as the chip will be heavier due to the liquid if it is dripping. I will ensure that the potato chips will have no skin on them at all by peeling the potatoes before the experiment begins,

2. ## To find out the factors affecting the refractive index of liquid by using different ...

Initial plan (for pilot test) Use the rectangular shape container; the ideal choice will be a deep container with long length but a short width. Put the container on a stand so that I can mark on the A4 paper underneath.

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