Ecology: 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.

Download free labs:

(student versions)

Computer-based lab (PDF, 580 KB)

Xplorer GLX-based lab (PDF, 608 KB)

Method:

Use a pH Sensor to measure the acidity or alkalinity of community soil samples using a standard procedure.

Here's What You Need:

Required for computer-based lab:

(See lab download for Xplorer GLX-based lab requirements, which may differ)

Probeware

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

Lab Manual:

The computer-based activity is included in Explorations in Biology (PS-2807). The Xplorer GLX-based lab is included in Biology with the Xplorer GLX (PS-2820). Both manuals are complete with Teacher Information pages, student instructions and handouts, and sample data.

For your convenience, we offer bundles which provide the probeware for the activities in the manual. For more, please see:
Computer-based Biology Lab Manual and Bundles
Xplorer GLX-based Biology Lab Manual and Bundles