• 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
8. 8
8
9. 9
9
10. 10
10
11. 11
11
12. 12
12

# Osmosis in potato cells.

Extracts from this document...

Introduction

Roxana Jahanshahi Osmosis in potato cells. I will be using potatoes to find out the rate of osmosis in plant cells as the concentrations in a solution increase. Preliminary Test Apparatus: > Ruler > Scalpel > 1 Potato > 3 Test Tubes > 10cm� Measuring Cylinder > Test Tube rack > Distilled Water > Weak sodium chloride solution (8.5%) > Strong sodium chloride solution (17%) Method: > Cut 3 chips of potato to the exact same size > Using a ruler measure their length and record it on a table. > Fill 3/4 of the test tubes ==> One with Distilled Water ==> One with Weak Sodium Chloride Solution ==> One with Strong Sodium Chloride Solution > Place a potato chip into each test tube and record it onto your table and leave them there for 30minutes > Remove the chips from the test tube after 30 minutes have passed > In order to remove any excess liquid place the potato chips on a paper towel > Measure each chip and re-measure the length and record it on the table. Results: Test-Tube Liquid in Test-Tube Original length of chip (cm) Final length of chip after 30 minutes (cm) Change in length of chip (- or + cm) Percentage Change (%) A Distilled water 4 4.3 +0.3 7.5% B Weak sodium chloride solution 4 4 0 0% C Strong sodium chloride solution 4 3.8 -0.2 -5% Conclusion: There was a variation of osmosis in each of the potato chips depending on the concentration of the solution. As the concentration of solute increased the length of the potato chip decreased. The potato chip that was in the least concentrated solution (distilled water) ...read more.

Middle

1.95 1.87 1.88 1.81 1.77 1.76 -23.8 -0.54 0.8 1 2.29 1.91 1.87 1.85 1.77 1.72 1.74 1.71 1.70 -25.8 -0.59 2 2.31 1.97 1.91 1.86 1.78 1.79 1.80 1.76 1.74 -24.7 -0.57 3 2.29 1.98 1.93 1.93 1.81 1.81 1.79 1.78 1.75 -23.1 -0.54 2.30 1.95 1.90 1.88 1.79 1.77 1.78 1.75 1.73 -24.8 -0.57 1.0 1 2.29 1.77 1.78 1.77 1.68 1.69 1.73 1.70 1.71 -25.3 -0.58 2 2.30 1.81 1.81 1.79 1.71 1.73 1.76 1.74 1.74 -24.3 -0.56 3 2.31 1.80 1.81 1.80 1.70 1.73 1.75 1.73 1.72 -25.2 -0.59 2.30 1.79 1.80 1.79 1.70 1.72 1.75 1.72 1.72 -25.2 -0.58 1.2 1 2.28 1.78 1.70 1.69 1.64 1.62 1.65 1.64 1.65 -27.6 -0.63 2 2.29 1.84 1.80 1.80 1.73 1.70 1.74 1.74 1.74 -24 -0.55 3 2.29 1.82 1.76 1.75 1.68 1.70 1.73 1.72 1.72 -24.9 -0.57 2.29 1.81 1.75 1.75 1.68 1.68 1.67 1.71 1.72 -24.9 -0.57 1.4 1 2.30 1.83 1.81 1.83 1.76 1.75 1.76 1.74 1.76 -23.5 -0.54 2 2.27 1.85 1.78 1.82 1.72 1.72 1.71 1.73 1.74 -23.3 -0.53 3 2.30 1.79 1.78 1.83 1.70 1.73 1.74 1.72 1.72 -25.2 -0.58 2.29 1.82 1.79 1.83 1.73 1.73 1.74 1.73 1.74 -24.9 -0.55 1.6 1 2.27 1.81 1.78 1.77 1.72 1.69 1.75 1.74 1.74 -23.3 -0.53 2 2.28 1.85 1.78 1.80 1.76 1.73 1.80 1.77 1.77 -22.4 -0.51 3 2.31 1.76 1.69 1.73 1.63 1.61 1.68 1.67 1.69 -26.9 -0.62 2.29 1.81 1.75 1.77 1.70 1.67 1.74 1.73 1.73 -24.5 -0.56 1.8 1 2.31 1.88 1.77 1.81 1.75 1.61 1.75 1.74 1.75 -24.2 -0.56 2 2.27 1.78 1.68 1.77 1.66 1.63 1.68 1.67 1.70 -25.1 -0.57 3 2.27 1.79 1.68 1.73 1.65 1.61 1.66 1.65 1.66 -26.9 -0.61 2.28 1.81 1.71 1.77 1.69 1.64 1.70 1.69 1.70 -25.4 -0.58 2 1 2.30 1.86 ...read more.

Conclusion

This agrees with the theory as all other results show a decrease in mass. As the Molar increased it seemed as though there was negative water potential. > The lower the Molar concentration of solution the more turgid the cells are. The cells began to swell up with the water from the surrounding solution. The potato chips felt harder in the 0Mols, 0.2Mols and 0.4Mols solutions. > As the Molar concentration increased the cells began to plasmolyse. This is shown by the loss of mass in the cells. This is distinct in the cells that were placed in the solutions of 0.4Mols and above. This is because there was a greater concentration of solute outside the cell. > The isotonic point where there was no net change in the mass of the potato chip was .As shown on my graph. This means that solutions on either side of the membrane have equal concentrations of solute in them. Evaluation I felt my experiment went well the main problem occurred when I had to cut 36 potato chips using the cork borer. This was time consuming and although I tried to keep the chips damp after awhile I saw a few of them going black/grey. If the experiment was put over a longer period of time and there were more concentrations, maybe increasing it to 4Mol/dm�, the results would have been better. Working as part of a greater team would also help and shorten the time that was wasted when I was recording the mass of some potato chips and the rest were left in their solutions for too long (maybe affecting the result). I could next time maybe look at how other factors affect the movement of osmosis such as temperature. This could be achieved by using facilities such as a water bath. ...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

# Related GCSE Life Processes & Cells essays

1. ## Investigating the effect of Sucrose Concentration on the Rate of Osmosis in Potato Chips.

5 star(s)

investigation to a stage where the potato chip was weighed at twenty minute intervals after the hour, and the change in mass had not varied between this time. No variation in mass would have proved that osmosis was complete and I could terminate that experiment because the potato cells were either completely plasmolysed or turgid.

2. ## Osmosis is defined as 'the movement of water molecules from an area of high ...

-0.17 -10.240 4 1.61 1.46 -0.15 -9.3167 5 1.66 1.49 -0.17 -10.240 6 1.56 1.42 -0.14 -8.9743 average 1.60833 1.4066 -0.2016 -12.621 This graph shown above gives the line of best fit for the percentage change in mass of the potato chips over the course of the thirty minute experiment.

1. ## Investigation to compare the water potential between potato chips and carrot chips.

I set the apparatus as shown in the following diagram: Once this is done I will follow a similar method to the one which I will carry out when using both carrots and potatoes. The quick method I carried out was: Make solutions - different concentrations, put solutions into test

2. ## Factors Affecting Osmosis.

and always keeping the length of the potato cylinders constant at 2cm/20mm. 2. The temperature at which the experiment takes place must be kept constant because the temperature will affect the rate at which osmosis will occur. For example if the temperature increases at all during the experiment the molecules

1. ## In this investigation the main aim is to find out how many grams of ...

After drawing the graphs, the recorded results will be analysed and the investigation will be concluded and evaluated. Apparatus * 6 test tubes * 2 test tube racks * 12 labels * Distilled water * 0.5% salt solution * 1.0% salt solution * 1.5% salt solution * 2.0% salt solution

2. ## Investigating the cellular water potential of potato cells.

Therefore, each sample of potato would not be exactly the same size and so would not have the same surface area, this would affect the experiment as osmosis would be allowed to occur at a grater rate in those samples with a larger surface area.

1. ## Investigate what happens to a potato chip's weight when placed in different concentrations of ...

These cells are said to be 'plasmolysed'. When plant cells are put into solutions that have the same osmotic strength as the plant cells, they are in a state between turgidity and flaccidity. This is called 'isotonic', meaning equal. The potato cells will have decreased in length, volume and weight.

2. ## The aim for this Biology coursework is to investigate hoe the concentration of sodium ...

This condition, called plasmolysis, can induced experimentally in living cells with out necessarily harming them, but it is an extreme condition but it rarely occurs un nature. But for humans, the cell is very different to plant cells. As humans cells don't have a cell wall, so our cells can't

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