Difference in mass
I think it would look like this because the more concentrated the solution is, the less it will weigh because the water from the potato will move into the higher concentrated area therefore the potato loses mass which is why my line is moving down slowly.
The Experiment.
Method.
In my experiment I will use various apparatus/equipment; here is a list of that equipment:
In order to do my experiment I will:
Firstly, I will chip one potato into pieces using a potato cutter (chipper); I will then select nine chips of potato and cut them into accurately measured chips using a sharp knife. After that I will weigh each chip on a set of scales in order to calculate the difference after osmosis has taken place. I will then place one potato in each of the nine test tubes and add the correct concentration ( 0.25m sugar, 0.5m sugar, 0.75m sugar, 1m sugar, water, 0.25m salt, 0.5m salt, 0.75m salt, 1m salt ) of solution to each tube using a measuring cylinder and pipette to measure accurately, and place them in a test tube rack, whilst osmosis is taking place I will add a sticker to each tube to interpret the molar and weight of each tube and potato. I will wait exactly thirty minutes and then empty the solution and potato to place on blue paper to remove any excess water, weigh each potato to see the changes that occur and finally record the changes that occur.
Fair Testing.
To make sure my experiment is a fair test I will:
- Make sure I add the same amount of solution to each test tube, a different amount of solution cold mean different reactions taking place.
- Use only one type of potato, a different type could mean different results.
- Make sure each potato chip has the same surface area if not they could absorb different amount of solution.
- Keep all tests in the same environment, otherwise light or heat could affect osmosis.
- Make sure I remove each potato from the test tubes at the same time, otherwise water could change places.
- Make sure I remove any excess water from each potato; otherwise different weights could be produced.
- Weigh each potato correctly with no interference before and after the experiment, it could affect weights otherwise.
- Make sure no other people interfere with the procedure or it could change the results.
Trial Run Results.
From these results you can see that most of the potatoes have lost weight. I believe this is because the higher the molar (concentration) the more weight it will lose because the water from inside the potato will travel to the higher concentrated area e.g. the solution.
My results back my idea up because as you can see the 1m sugar lost 0.30 grams and the 1m salt lost 0.33g. The water potato gained weight because the concentrations are the same in the potato and outside the potato which means water can travel into the potato, as you can see the water experiment gained 0.33g.
Final Results.
Analysis.
My results show that the higher the concentration of solution the more water is lost from the potato through diffusion, but lower solutions such as water show that the potato gains weight because water from the solution moves into the potato.
My Graphs look like this:
