PURPOSE: This experiment will explore the concentration gradient by measuring the rate of diffusion in a number of theoretical cells. The objectives for this lab are: (1) To define concentration gradient, (2) To explain experimental data concerning different concentration gradients, (3) To complete a data table and prepare a graph to illustrate the data, and (4) To apply information from this experiment to other related problems.

MATERIALS: 5 pieces of dialysis tubing, glucose solutions in concentrations of 20%, 40%, and 80%, Tap water, String, Balance, 5 beakers, Stopwatch

Each lab will include: Introduction, Statement of Purpose, Safety Precautions, Materials List, Lab Procedure, Data Tables, Student Data Pages, Follow up questions, and Teacher Preparation Notes.

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