Featured in PASCO’s Biology through Inquiry Teacher Guide

Biology through Inquiry Teacher Guide


Features 25 inquiry based labs covering the fundamental concepts of cell biology, ecology and physiology.

Soil pH

Lab Summary

Use a pH sensor to understand what kinds of soil in the local community would support agricultural crops, based on pH level.


Guide students to understand what soils, in their local community, would support agricultural crops, based on pH level.

  • Record detailed observations about the environment where the soil samples were taken.
  • Determine and compare the acidity or alkalinity of each soil sample.


Students gain experience conducting the following procedures:

  • Gather soil samples from different locations in the area and record detailed observations.
  • Measure the acidity or alkalinity of three different soil samples using a pH sensor.

Sensors / Equipment Used:



Has a wide measurement range of 0 to 14 pH. Has a resolution of 0.01 pH. For use with PASPORT Interfaces.

PASPORT Sensor Extension Cable


Allows an additional two meter length extension on all PASPORT sensors.

Materials Used:

Beaker, 250-mL (3)

Graduated cylinder, 100-mL

Measuring spoons (1 set)

Stirring rod

Wash bottle

Digging device

Sealable plastic bag (3)

Soil sample, 60 mL (3)

Distilled water, 400 mL

Paper towels

Marking Pen

The Associated Bundle:

Biology Standard Sensor Bundle


The Biology Standard Sensor Bundle includes a photosynthesis tank and the sensors required to perform 19 of the 24 Lab Activities in the Biology through Inquiry manual.

Interface Required

This experiment may require software and an interface for data collection.