• 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

# Osmosis, Aim: To investigate the movement of osmosis through a selectively permeable membrane, in this case potato.

Extracts from this document...

Introduction

Osmosis Aim: To investigate the movement of osmosis through a selectively permeable membrane, in this case potato. Introduction We are carrying out an experiment to try to prove the theory of osmosis, which is the overall flow of water from a dilute concentration to a higher concentrated solution through a semi-permeable membrane. In this experiment I will be analysing the change of mass of potato slices when placed in a sucrose solution. Science theory Osmosis in this case is the diffusion of water through a semi-permeable membrane, which, in this experiment is the potato cell from a low concentration to a high concentration of sucrose solution. If two solutions of different concentrations are separated by a semi-permeable membrane which is permeable to the smaller solvent molecules but not to the larger solute molecules, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concentrated solution, this process is called osmosis. More water molecules move away from an area of higher concentration of water molecules. This is a type of diffusion. Diffusion is when molecules in gases and liquids move about randomly. They collide with each other causing them to change direction. ...read more.

Middle

Solution (ml) Water (ml) Mass (g) Final Mass (g) Change in mass 1.0 40 0 3.52 1.84 1.72 0.75 30 10 2.81 1.82 1.01 0.5 20 20 2.98 2.01 0.98 0.25 10 30 3.41 3.04 0.41 0 0 40 3.38 3.92 -0.42 Method 1. We will take one average sized potatoes and use a core borer to get 18 potato chips. 2. We will do this on a white tile to make sure we do not damage the tables because the core borer is extremely sharp. 3. Thereafter we will use a scalpel to cut each chip precisely to 3 cm long using a 30cm ruler. 4. We will then use a test tube rack and place 5 test tubes in it and label them: 0 molar, 0.25 molar, 0.5 molar, 0.75 molar and 1 molar. 5. Using a measuring cylinder I will measure the different amounts of sucrose solutions and water that needs to be placed into the 100ml beakers. 6. I will place one sticker label on all the beakers used to identify the different amount of solutions in each beaker. 7. But before pouring in the solutions in the 100ml beakers I will weigh the chips each to get their initial mass in grams and record the results onto a table. 8. ...read more.

Conclusion

Also I would make sure that the potatoes I use will not be crippled or dodgy potato, I will try to get a big accurately circular shaped potato so that the potato chips would not have all the slightly crooked shapes. Also I would try to clean and wipe off the bits of water that were still on the weighing scale and make sure that it is dry to make sure that these water particles do not alter my results. These improving methods that I could use and the problems we had, suggest that the results were reliable but could have been a lot more reliable if I were to improve the experiment with the ideas that I gave above. My results table above shows the two outliers highlighted and that is all the outliers I received and the outliers both reflected on my graph. Also, my graph showed me that my results were reliable as I received several small error bars, increasing the reliability; also I noticed the line of best fit changing at the end of the graph, this was showing me that plasmolysis occurred in my potato slices. Plasmolysis is the loss of water from a cell, in this case a potato cell, causing it to contract and deform. ?? ?? ?? ?? Zubbair Ghani 11W ...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. ## GCSE Bioligy Case Sudy - MRSA

5 star(s)

After that the cells cytoplasm is pulled into two whilst trying to encirculate both of the newly produced seperate DNA molecules. The bacteria then grows to twice its original size before a cell wall begins to form between the two sets of DNA, dividing the original cell into two separate cells (3).

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

So the concentration of the solute content of potatoes must be 0.23%. Prediction: In Section P. I predicted that the potatoes would have a solute content at around 0.25%. The real solute content of the potato was 0.23%. This proves my prediction was accurate.

1. ## Osmosis is the diffusion of water through a semi-permeable membrane, moving from a dilute ...

The plant organism that I have chosen to use to show this will be a potato. I will be hoping for a change in the weight of the potato pieces, to prove that the movement of water molecules (osmosis) during the experiment has taken place.

2. ## Osmosis is the diffusion of a solvent from a less concentrated solution into a ...

4-8%, the cells may lose more water by Osmosis. For example, if a potato cylinder was left in a solution of 6% sucrose, its mass before being 1g, then I predict that by the end of the experiment its mass will have reduced to 0.85g, a 15% change in mass.

1. ## The Consequences of Osmosis

However if I was to repeat the experiment I could possibly try to find out the saturation point of the potato. The range of concentrations was adequate but I would possibly create more concentrations if I repeated the experiment so that I would have a larger amount of results to test this idea further.

2. ## My aim throughout this investigation is to investigate the movement of Osmosis through a ...

I believe this because the higher the concentration of the glucose solution the lower the concentration of the water. When the potato chip is put into the solution, it will, by osmosis lose some of it's water and the water will defuse into the solution of glucose, causing the potato

1. ## Looking at how concentration affects the movement of water particles through a partially permeable ...

A more concentrated solution therefore has a more positive osmotic pressure but a more negative osmotic potential. Osmosis not only occurs when a solution when a solution is separated from its pure solvent by a partially permeable membrane but also arises when such a membrane separates two solutions of different hypotonic, solution, to the more concentrated, or hypotonic, solution.

2. ## Osmosis, Aim: Investigate the movement of osmosis through a selectively permeable membrane, in ...

To begin, we used 15mls of Glucose solution- this was the amount needed to cover one piece of potato. The first thing we needed to observe, was how different concentrations affected the weight and length of the potato. We therefore needed to observe each end of the spectrum.

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