# Diffusion

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Diffusion
Ronald Wilson
Pd:4th
11/16/12

Introduction In this experiment diffusion and osmosis is the main idea. When using diffusion and osmosis you are trying to separate different solute concentrations on either side of the membrane. Only a solute's relative concentration, or water potential, affects the rate of osmosis. The higher the concentration of solutes, the faster water will flow through the membrane to equalize the concentration. The way we describe the movement from higher to lower concentration or lower to higher concentration is called hypotonic solution and hypertonic solution.

Hypothesis:

My Hypothesis for diffusion that the starch solution will be hypotonic and diffuse into potassium iodide (IkI).

Hypothesis for osmosis is that each of the individual dialysis bags will increase because of the different concentration of the solutions. Which makes this and hypotonic experiment.

Hypothesis for this experiment is that each of the four cylinders of potato will decrease in mass, because of the solution/concentration of each cup.

Data collection

A. Diffusion Color Glucose Content | Time | Dialysis bag | Beaker | Dialysis bag | Beaker | Start | Clear | Amber brown | +(black) | - | 30 minutes | Dark blue-black | Amber brown | +(black) | +(-) |
*experiment went wrong the beaker is suppose to be -

B. Osmosis Solution | Dialysis bag initial mass (G) | Dialysis bag initial mass (G) | Change mass(g) | % change in mass | water | 22.8g | 21.8g | 1.01 | -4.40% | 0.2M | 21.8g | 25.0g | 3.2 | 14.70% | 0.4M | 24.5g | 24.7g | 0.2 | 8.20% | 0.6M | 25.45g | 26.2g | 0.75 | 2.95% | 0.8M | 25.2g | 27.2g | 2.01 | 7.94% | 1.0M | 19.15g | 21.8g | 2.65 | 13.80% | Water potential Solution Temp Potato Cylinders |

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