Featured in PASCO’s Biology through Inquiry Teacher Guide
Features 25 inquiry based labs covering the fundamental concepts of cell biology, ecology and physiology.
Buffers in Biological Systems
Use a pH sensor to determine which solution is the best buffer.
In this activity, students examine the role that buffer solutions have on the ability to balance the pH homeostasis. Students:
- Determine the pH change when they mix an acid with water.
- Determine the pH change when they mix an acid with club soda, which is a buffered salt solution.
- Determine which solution is the best buffer.
Students will gain experience conducting the following procedures:
- Use the pH Sensor to measure the change in pH in water and in club soda when they add an acid to them.
- Compare the change in pH of water and club soda.
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.
A "must-have" piece of lab equipment when doing titration experiments.
The V-shaped, plastic-coated jaws will gently hold a buret and lock at any angle.
The Large Base and Support Rod includes built-in leveling screws and an aluminum rod that is 12.7 mm (1/2 in.) in diameter and 45 cm long.
Graduated cylinder, 10-mL
Beakers (3), 250-mL
Club Soda, 200-mL
Vinegar, 5% acetic acid, 20 mL
Distilled Water, 1 L
The Associated 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.