Experiments

Here are experiments our science specialists have selected to support this IB* topic.

Diffusion

Experiment #2 from Investigating Biology through Inquiry

After completing the Preliminary Activity, you will first use reference sources to find out more about diffusion and diffusion through a membrane before you choose and investigate a researchable question dealing with diffusion rate. Some topics to consider in your reference search are:

• diffusion
• facilitated diffusion
• concentration gradient
• salts
• ion channels
• ions
• dialysis
• semipermeable membrane
• active transport

Diffusion through Membranes

Experiment #4 from Biology with Vernier

In this experiment, you will

• Use a Conductivity Probe to measure the ionic concentration of various
  solutions.
• Study the effect of concentration gradients on the rate of diffusion.
• Determine if the diffusion rate for a molecule is affected by the presence of a second molecule.

Educational Standard

International Baccalaureate (IB) 2025

Subject

Biology

Theme

D Continuity and change

Level of organization

2 Cells

Topic

D2.3 Water potential

Section

Standard level and higher level