Ecology: Water and pH

Find out how the pH of water from different sources changes when acid is added.

Lab Summary:

In this exploration, students will use sensors to measure the pH and conductivity of a variety of water samples. Then students will determine which water samples are more sensitive to the addition of acid regarding changes in pH.

Students will correlate the level of conductivity in the water, which indicates the level of dissolved solids, with the reactivity of the pH of the water to the added acid. Finally, students will synthesize their laboratory observations with their understanding of the impact of acid rain and acidic or basic pollutants on different ecosystems.

Download Free Lab  (PDF, 688 KB)

(student version)

Method:

Use the pH and Conductivity Sensors to measure the pH and conductivity of a variety of water samples.

Here's What You Need:

Probeware

Other Materials

  • Clean Containers with Lids
  • Labels and Labeling Pens or Pencils
  • Beaker, 250-mL
  • Small Container (for diluted vinegar solution)
  • Pipet with bulb
  • Wash bottle and Waste container
  • Protective Gear
  • Water, 250.0 mL
  • Water, Distilled, 250.0 mL
  • Mountain Spring Water, 250.0 mL
  • Water samples from local waterways , 250.0 mL
  • White Vinegar, 250.0 mL

Lab Manual:

This activity is included in Explorations in Biology (PS-2807), complete with Teacher Information pages, student instructions and handouts, and sample data for a total of 25 probeware-based labs. For your convenience, we offer bundles which provide the probeware necessary for the activities in the manual. For more information on these resources and bundles, click here.