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Osmosis. Aim To investigate how the concentration of salt solution affects osmosis in potato chips.

Extracts from this document...

Introduction

Science Coursework By Muhammed Abdul Sakib Contents Aim Pg 3 Variables Pg 3 Background knowledge Pg 4 Preliminary work Pg 5 Prediction Pg 6 Hypothesis Pg 6 Equipment Pg 7 Diagram Pg 7 Fair test Pg 8 Plan Pg 9-10 Method Pg 10 Results Pg 11 Graph Pg 12-14 Analysis Pg 15 Conclusion Pg 15-16 Evaluation Pg 17 Improvements Pg 17 Further work Pg 17-18 Aim To investigate how the concentration of salt solution affects osmosis in potato chips. Variables: There are various factors that effect osmosis. These as follows: * size of potato * volume of water * concentration of solution * temperature Size of potato The size of the potato chips could affect osmosis as different sizes could have different amounts of water concentration inside. A big sized potato chip would have a larger amount of water molecules inside which would mean that it had a larger concentration of water than a small sized potato chip. Volume of water The volume of water could affect osmosis, as in a high volume of water the molecules of water would move faster through the semi permeable membrane then in a low volume of water as the water pressure is higher in the higher volume. Concentration of solution The concentration of the solution determines the rate of osmosis as if the solution has a high concentration of salt then the water molecules would move through the semi permeable membrane into this solution as the water concentration on this side was low. Temperature The temperature is a factor that could affect osmosis. Molecules at a high temperature will have more kinetic energy and are able to move faster, so diffuse faster than a same molecule at a low temperature. The variable that I have chosen to investigate in this investigation is concentration of the salt solution. I will vary the salt concentration to be able to calculate what effect salt concentration has on osmosis in the mass of the potato chips. ...read more.

Middle

I will cut out ten potato chips so that I can put 2 in each tube. After I have cut the potato chips I will weigh each one separately and record it into my result table. 3. I will then put five boiling tubes onto a test tube rack. Then I will pour the concentrations of salt solution in their separate tubes and label them accordingly. 4. After that I will place two potato chips in each tube. I will leave the experiment for 24 hours for osmosis to take place in that time. After that time I will com back and take out the potato chips out of the tubes individually and weigh them for any change in mass and I will record this change in mass in my result table. 5. then I will calculate the percentage change in mass of the potato chips using this formula, Change in mass (g) Original mass (g) When weighing the potato chip before and after the experiment I will record the mass of the potato chip to two decimal places as in order to get accurate results I need to note the mass as accurately as possibly. I will also record these percentages changes in the mass of the potato chips to two decimal places into my result table. As I am using two potato chips in each boiling tube I can calculate an average percentage change in the mass of the potato chips which will mean that I will get more reliable and accurate results. Method I carried out the experiment as a have already have already specified in my plan but I just changed a few things. The things that I changed are as follows. I didn't use boiling tubes as they were not available for use at the time, so I had to use smaller test tubes to carry out this experiment. ...read more.

Conclusion

This would have meant that I could have got I third set of results to compare and to get a better average as some of the results even though very accurate were still quite far apart. Further work Further work that could do into investigating osmosis is to use another variable and study how this variable affects osmosis in potato chips. The variable I would investigate would be how the size of a potato chip affects osmosis. For this experiment I would have the size of the potato chips as my controlled variable. The variables that I would keep constant would be: > Temperature > Volume of water > Concentration of solution There would be five different sized potato chips which were from the same type of potato. The sizes of the potato chips would be 10mm x 10mm, 10m x 20mm, 10mm x 30mm, 10mm x 40mm and 10mm x 50mm. Each potato chip would be placed in different boiling tubes of water. To keep the variable constant the volume of water in each boiling tube would be 20ml. The potato chips would be left in the boiling tubes of water for one hour each. Each potato chip would be weighed before and after being placed inside the boiling tubes to measure the percentage change in mass foe each different sized potato chip. I would then record the results in a results table. Each boiling tube would be set up as shown in the diagram below: In this experiment I would expect to see that the smallest potato chip to have the greatest percentage gain in mass and the large potato chip to have the least percentage gain. This is because the small potato chip has a lower concentration of water compared to the large potato chip, so more water molecules would diffuse from the high concentration of water in the beaker into the potato chip. I could then compare that set of results with the result from this investigation to see if they both have similar outcomes. ?? ?? ?? ?? 2 ...read more.

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