Osmosis is a kind of diffusion which only occurs with water. With osmosis, there is a membrane which does not allow dissolved material to pass though it but only water (selectively permeable) Osmosis is the movement of water molecules from a weak solution to a strong solution. Osmosis occurs when water is taken up e.g. Plants take up water from the ground.
The first observation I made was after the potato cylinders were placed in their solutions I noticed that the potato cylinders in the 0.0M and 0.2M solutions were floating and the ones in the 0.4M, 0.6M, 0.8M and 1.0M solutions were at the bottom of the test tube, this lead me to drawing my first conclusion. The graph (see attached) shows that the potato in the 0.0M solution and in the 0.2M is hypertonic, as I said in my prediction, this means that there is a higher water potential in the distilled water and 0.2M solution than in the potato, which has a high concentration of solutes. Therefore this is why the water diffuses by osmosis down the concentration gradient from high concentration to low concentration, resulting in the potato gaining mass. The opposite oc ...
change in mass compared to their starting mass. To get around this problem we must
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