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.
Downloads
- Download Free Lab (PDF, 688 KB) (685 KB, .pdf)
(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
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.
PASPORT Conductivity Sensor (PS-2116A) - $110
Utilizes platinum probes for greater range and improved accuracy in high & low concentrations.
Xplorer GLX (PS-2002) - $349
The Xplorer GLX is a data collection, graphing, and analysis tool designed for science students and educators.
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
