Osmosis Lab

Topics: Osmosis, Semipermeable membrane, Diffusion Pages: 2 (529 words) Published: October 8, 2010
Diffusion and Osmosis lab


Figure 1a-rate of weight change in 15 min intervals of each concentration. The first tube showed very little weight change. However all other tubes show a greater change the concentration could be the factor that determines the permeability of the sucrose. The sucrose molecules are too large to pass through.

Figure 1b- sucrose concentration determines the weight change. In this case based on our results as concentration increases the percent weight change is decreasing.

The purpose of this lab was to observe and analyze various factors that affect the process of diffusion and osmosis. We observed that the permeability of the dialysis tubes, which is our permeable “membrane”, depends on the concentration of the sucrose, not only is it important how permeable the tube is but also the rate at which osmosis is occurring. Water moves across the selectively permeable membrane of the dialysis tubing much easier than sucrose sugar does. The water moved to reach equilibrium between the solutions. Sucrose must be too large a molecule to pass through the membrane quickly. That was visible based on the observations for the first tube at 1.Unfortunately our observations can not be too accurate since we ran out of 40% sucrose to do any observations and analysis on the permeability of the membrane when tap water is inside as the solute and the sucrose as the solvent.

Questions part I:

What relationship exists between the concentration of sucrose and the rate of osmosis? -The rate of osmosis depends on the concentration of sucrose the water will move from a lower concentration to a higher concentration. What factors may have contributed to any errors in measurements?

The factors that could have contributed to any errors in measurements, are incorrect pipetting, gives you less or more of the required amount needed in the dialysis bags, and will change the mass of each bag that is to be recorded. The balances...
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