Investigating the Effect Off Different Concentrations of Sal

Osmosis is the diffusion of water particles. In this case the osmosis-taking place was varying concentrations of salt water passing through a semi permeable membrane of a plant cell (potato). This semi permeable membrane allows only certain particles to pass through it and effectively selects which particle passes through it. Smaller molecules like water can easily pass through the membrane of a plant cell, but larger molecules like sugars and starches cannot. For this experiment to take place, raw potato was needed because if it was cooked, the heat would have denatured the cells and osmosis would not occur. The reasoning behind using a plant cell is that all plant cells have a cell wall and animal cells do not, therefore if an animal cell was to absorb large amounts of water it would burst!

Preliminary Investigations: This experiment will work as a preliminary experiment as it allows me to determine the rough isotonic point of the potato in the water. Then I will further the investigation by using a smaller range of concentrations to find the exact isotonic point. I also did a preliminary experiment

Preliminary Experiment 1 – Onion Membrane:

All the chips will be 3 cm in length and be measured to a tenth of a millimetre using the calliper. Then I will weigh each ship and group them in 3’s. I will then label 5 boiling tubes and fill each with the corresponding water ranging from 0.1M to 0.4M concentration of salt water. Then one will be filled with regular water (distilled). Then each of the chips will be soaked in the solutions (3 in each tube) for 40 minutes to allow time for the osmosis to take place. After I have done this I will remove the chips, weigh them and measure them and fill in the results.

Some topics in this essay:
Osmosis Potatoes, Fair Test, Membrane Introduction, , Plan Using, Preliminary Investigations, Evaluation Overall, PTO Observations, Diagram Equipment, Vernier Calliper, salt water, concentration salt, plant cell, semi permeable membrane, change mass, cell wall, cells plasmolysed, semi permeable, permeable membrane, preliminary experiment, concentration salt water, cytoplasm contracts cell, concentrations salt, osmosis potatoes experiment, contracts cell wall,