• 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

# To investigate different concentrations of sucrose, between OM and 1M and to find out how potato chips in the solutions change in mass because of the process of osmosis.

Extracts from this document...

Introduction

An Investigation showing how the mass of potato chips changes due to osmosis PLANNING: Aim: To investigate different concentrations of sucrose, between OM and 1M and to find out how potato chips in the solutions change in mass because of the process of osmosis. Prediction: I think that the percentage change in mass of the potato will decrease as the concentration of sucrose in the solution is increased. I think this because "osmosis is the net movement of water through a selectively permeable membrane across a concentration gradient (from a high concentration of water to a low concentration of water)"- www.biology-online.org. This means that the holes in the membrane will allow water to pass in and out of the solution and the potato, depending on the concentration gradient of the two substances. In this case, when the water concentration is lower in the tissue, then the water moves into the tissue of the potato. This causes the potato to increase in mass. If there is a lower concentration of water in the potato, then the water moves into the tissue of the potato. This causes the potato to increase in mass. If there is a higher concentration of water in the potato, then the water moves out of the potato. ...read more.

Middle

* Cover the test tubes with a bungs and leave in a cool place for 50 minutes * Take the potato chips out from the sucrose and blot them in kitchen paper to absorb any sucrose. * Weigh them again and take an average reading Molarity of sucrose solution (M) Water (cm3) Sucrose solution (cm3) 0.0 10 0 0.1 9 1 0.2 8 2 0.3 7 3 0.4 6 4 0.5 5 5 1.0 0 10 OBTAINING EVIDENCE: Method: * I took a potato and cut out 21 cylinders from it, using a cork borer. * After laying all 21 pieces of potato on a tile, I used a scalpel to cut them down to 3 cm in length. * I put a blue pin in all the potato chips in the set of potatoes laid out for my second repeat and an orange pin in the chips for the third repeat. * I measured each potato chip separately on an electronic balance and recorded the results in a table. * I took 7 boiling tubes, put them in a test tube rack and placed amounts of sucrose solution and tap water as shown in the table above. ...read more.

Conclusion

The cell membrane in cells is semi-permeable and the vacuole contains a sugar/salt solution. So when a cell is placed in distilled water (high water concentration), the water will move across the semi-permeable membrane into the cell (lower water concentration) by osmosis, making the cell swell. This cell is now referred to as turgid. If done with potato cells the cells would increase in length volume and mass because of the extra water. If these potato cells were placed in a solution with a low water concentration, then the opposite would happen. Water would move out of the cell into the solution. In extreme cases the cell membrane breaks away from the cell wall and the cell is referred to as plasmolysed. The potato cells will have decreased in length, volume and mass. The greater the concentration of water in the external solution, the greater the amount of water that enters the cell by osmosis. The smaller the concentration of water in the external solution the greater the amount of water that leaves the cell. However, there will be a point where the concentrations of water inside and outside the potato cells are equal and this is when equilibrium is formed. At this point there will be no change in the length, volume and mass of the potato, as the net movement of water will be zero, no osmosis has occurred. Evaluation: ...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)

Nevertheless when the concentration of sucrose is 1.0mol/litre, a 50mm potato chip weighing 3.88g, is soaked into this for one hour and the average percentage change in mass is an 18.04% decrease.

2. ## An experiment to investigate how the effect of varying concentrations of salt solutions play ...

4 star(s)

These values are as follows: To get: -2.0 moles in 20cm3 of water using the 2m solution, add no water -1.5 moles in 20cm3 of water using the 2m solution, add 5cm3 of water to 15cm3 salt solution -1.0 moles in 20cm3 of water using the 2m solution, add 103

1. ## An experiment to show osmosis in potato chips in different concentrations of sucrose solution ...

3 star(s)

* In beaker A, using a measuring cylinder measure out 100ml of water and pour the water into beaker A. * In beaker B, using a measuring cylinder measure out 80ml of water and 20ml of sucrose solution, mix the two together and pour into beaker B.

2. ## To investigate how varying the concentration of sucrose solutions affects the rate of osmosis ...

3 star(s)

To stop his from happening, the beaker and syringe must be washed every time they are used. Better still, I used different syringes and droppers for each solution. Results obtained during the prior test: For potato cylinders immersed in distilled water: INITIAL LENGTH FINAL LENGTH INITIAL MASS FINAL MASS 4.50cm

1. ## How Does The Concentration of a Sucrose Solution Affect The Mass of a Potato ...

In my prediction I said that I expected the results after two days to show a more clear pattern and this proved to be correct. Explanation I believe that the results showed the above pattern because of the osmosis taking place inside the potato cells, (refer back to Introduction for full explanation of osmosis).

2. ## Osmosis. Aim ...

So the water molecules moved from the salt solution into the cells of there of the potato chip. As the water had omosed into the cells of the potato, the potato chip gained in mass by a percentage increase of 7.08%.

1. ## To investigate osmosis in potato chips when being placed in sugar solutions of different ...

When the cell loses water it shrinks and becomes flaccid, when it gains water it increases in size and becomes turgid. (P8B) Background information Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.

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

means that the percentage gain and loss in mass and concentration are not directly proportional. However, there is a pattern on my graph, and this is, as the concentration of the solution increases, the percentage change in mass decreases. The graph shows that the percentage gain and loss in inversely proportional to the concentration.

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