FREE SCIENCE LESSON - “Osmosis Diffusion Lab: The Effect of Concentration on the Rate of Diffusion”

by Amy Brown Science
8th - 12th Grade

No unit on cell structure and function is complete without comprehensive lessons on cellular transport. Students need a solid understanding of osmosis, diffusion, concentration gradients, solute concentrations, hypertonic and hypotonic solutions, active and passive transport, etc. This classic lab explores how the solute concentration gradient affects the rate of diffusion and osmosis. Students will quantitatively determine the rate of diffusion, graph the data, and use the graph to predict the answers to new questions.

This biology lab is perfect for biology or life science students in grades 8-12

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:

• To define concentration gradient
• To explain experimental data concerning different concentration gradients
• To complete a data table and prepare a graph to illustrate the data
• To apply information from this experiment to other related problems.

MATERIALS: 6 pieces of dialysis tubing, sucrose solutions of varying concentrations, String, Balance, 6 beakers or plastic cups, Stopwatch

Related resources include:

Cell Structure and Function Powerpoint and Notes

Transport Across the Cell Membrane Worksheet

Cell Organelles Mix -n- Match Review Game

Transport Across Membranes Crossword Puzzle

Cells - Transport Across the Membrane Powerpoint Jeopardy Review

Test: Cell Structure and Function and Membrane Transport

Cell Structure and Function Bundle

Quiz or Study Guide: Introduction to Cells

Quiz or Study Guide: The Animal Cell

Quiz or Study Guide: The Plant Cell

Quiz or Study Guide: Transport Across Membranes

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