reach equilibrium on each side of a membrane. So as there was more and more sucrose in the dialysis tubes, more and more water was needed to equilibrate both sides. In the potato versus sucrose molarity lab, it shows an indirect relationship between the potato core and sucrose molarity. As sucrose increased, the potato core’s mass decreased. This is due to osmosis: the process of molecules moving from a “crowded” area to a less “crowded” area. Because the potato cores had a higher concentration than the water, molecules from the potato cores moved into the water. The data in our graphs matched the knowledge of osmosis and diffusion. However, there could have been many sources of error due to the “technical” parts of the lab. If a group tied the dialysis bags too tight, there wouldn’t be sufficient space for water to get in. Also, there could’ve been excess tubing as well as bag leaks and air bubbles. Even the electric balance could’ve led to errors in data due to its fluctuations in measurements. Water will always move towards a site with lower water potential. Water potential is very important in plants and animals. The water in plants can exist at low water potentials due to the cohesive forces of water molecules. This causes water to move from stem to leaf, lowering the water potential in the stem, which causes water to move from root to stem, and soil to root. This pulls water up through the xylem tissue of plants. Also, water potential helps in maintaining shape, and enabling active transport and photosynthesis. In animals, water potential plays an important role in the function of blood to maintain an isotonic internal environment. This eliminates the problems associated with water loss or excess water gain in or out of the cells, establishing
homeostasis. Water potential also affects both animal and plant cells in the process of osmosis. The movement of water into and out of cells based on water potential will cause the cells to either shrink or burst.