Soil pH
Living organisms have a narrow pH tolerance in which they can survive. You will measure the pH of several soil samples to determine the acidity, alkalinity, or neutrality of the soil. In addition, one soil solution will be tested for the presence or absence of clay-soil buffering components.
Lab Summary
In this exploration, students will use a pH sensor to measure the acidity or alkalinity of community soil samples using a standard procedure. A soil solution will be tested using the pH sensor, which electrochemically measures the hydronium ion concentration in the solution and digitally displays it as a pH value (0-14).
Students will acquire a hands-on experience using electronic pH probes similar to those used by soil scientists and environmental researchers.
Downloads
- Computer-based lab (PDF, 580 KB) (576 KB, .pdf)
(student version)
- Xplorer GLX-based lab (PDF, 608 KB) (541 KB, .pdf)
(student version)
Method
Use a pH Sensor to measure the acidity or alkalinity of community soil samples using a standard procedure.
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.
Xplorer GLX (PS-2002) - $349
The Xplorer GLX is a data collection, graphing, and analysis tool designed for science students and educators.
Other Materials
- Beakers (4), 100-mL
- Wash bottle and Waste container
- Stirring Rod
- Measuring Spoons
- Trowel or Digging Tool
- Funnel
- Pen or pencil
- Permanent marking pen
- Protective Gear
- Coffee Filter
- Vinegar, 35.0 mL
- Water, Distilled, 1.0 L
- Community soil samples in sealed bags
- Sealable plastic bags
