Diffusion
Explore the movement of molecules via diffusion and determine how temperature affects the rate of diffusion.
Students will clearly see a graphical representation indicating that increased temperature causes an increased rate of diffusion.
Lab Summary
In this exploration, students will explore the process of diffusion using a pH Sensor. By measuring the change in pH as ions diffuse into a solution, students will determine that ions move from an area of higher concentration to a less concentrated area, until a state of equilibrium is reached. In addition, students will study how temperature affects the rate of diffusion.
Downloads
- Computer-based lab (PDF, 548 KB) (544 KB, .pdf)
(student version)
- Xplorer GLX-based lab (PDF, 792 KB) (.)
(student version)
Method
Use a pH Sensor to study the process of diffusion.
Here's What You Need
U.S. Educator prices shown.
Probeware
PASPORT pH Sensor (PS-2102) - $79
Has a wide measurement range of 0 to 14 pH. Has a resolution of 0.01 pH. For use with PASPORT Interfaces.
PASPORT Temperature Sensor (PS-2125) - $30
Durable stainless steel temperature sensor with a wide measurable range. For use with PASPORT Interfaces.
Xplorer GLX (PS-2002) - $349
The Xplorer GLX is a data collection, graphing, and analysis tool designed for science students and educators.
Other Products
Buret Clamp (SE-9446) - $12
The V-shaped, plastic-coated jaws will gently hold a buret and lock at any angle.
Small Tripod Base and Rod (SE-9451) - $24
The steel rod is 9.5 mm (3/8 in.) in diameter and 50 cm long.
Other Materials
- Test tube, Medium
- Beaker, 500-mL
- Hot plate
- Wash bottle
- Waste container
- Pipet with bulb
- Kimwipes or paper towels
- Water, Distilled, 1.0 L
- Water, 450.0 mL
- Ammonia, 5.0 mL
