Geosphere: Soil pH

Measure the pH of several soil samples to determine the acidity, alkalinity, or neutrality of the soil. In addition, assess each sample and describe the type of crop it might sustain, if any.

Soil PH

Table showing the pH of three different soil samples collected at various locations. Inquiry question: is the pH too high or low? Why? Enlarge graph.

Lab Summary:

In this exploration, students will complete the first of a three experiment
series studying soil quality. In this particular exploration, they will use a pH Sensor to measure the acidity or alkalinity of community soil samples using a standard procedure.

Students will acquire a hands-on experience using electronic pH probes similar to those used by soil scientists and environmental researchers to determine which soil sample(s) may be suited for agricultural cultivation. In addition, students will propose suggestions to shift the pH of less desirable samples, to create soil that will support productive crops.

Download free labs:

(student versions)

Computer-based lab (PDF, 606 KB)

Xplorer GLX-based lab (PDF, 120 KB)

Method:

Use a pH Sensor to investigate community soil sample.

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

  • Digging Tool (Trowel)
  • Stirring Rod
  • Wash Bottle and Waste Container
  • Beakers (4), 100-mL
  • Graduated Cylinder, 100-mL
  • Measuring Spoons
  • Protective Gear
  • Sealable Plastic Bags
  • Permanent Marking Pen
  • Paper Towels or Kimwipes
  • Community soil samples in sealed bags
  • Water, Distilled, 60.0 mL (per sample)

Lab Manual:

The computer-based activity is included in Explorations in Earth and Environmental Science (PS-2809). The Xplorer GLX-based lab is included in Earth and Environmental Science with the Xplorer GLX (PS-2821A). 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 Earth and Environmental Science Lab Manual and Bundles
Xplorer GLX-based Earth and Environmental Science Lab Manual and Bundles