Featured in PASCO’s Biology through Inquiry Teacher Guide

Biology through Inquiry Teacher Guide

(PS-2870C)

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

Osmosis

Lab Summary

Use a barometer/low pressure sensor to explore the concept of cell membranes and how water and other substances pass through a membrane through the process of osmosis.

Theory

Students explore the concept of cell membranes and how water and other substances pass through a membrane through the process of osmosis. Students will:

  • Demonstrate an understanding of how water moves across a cell membrane through osmosis.
  • Explain how the flow of water is impacted by the concentration of solute within the cell.
  • Analyze how the cell membrane is a semipermeable membrane that allows molecules to move through based on size and charge.

 

Method

Students gain experience by conducting the following procedure:

  • Measure the change in mass and gas pressure for various dialysis bags containing different syrup concentrations.

Sensors / Equipment Used:

PASPORT Barometer/Low Pressure Sensor

(PS-2113A)

Measures atmospheric pressure changes and doubles as a low pressure sensor. For use with PASPORT Interfaces.

PASPORT Sensor Extension Cable

(PS-2500)

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

OHAUS Scout SKX Balance 200g

(SE-8823A)

Combines range, resolution and low cost, making it ideal for the student science lab. 200 g version.

Base and Support Rod

(ME-9355)

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.

Materials Used:

Beaker 100-mL (2)

Beaker, 400-mL

Graduated cylinder, 10-mL

Graduated cylinder, 50-mL

Funnel

Dialysis tubing (2), 5 cm

Thread (or dental floss) to tie dialysis tubing

Plastic tubing, 5 cm

Syrup (maple or corn), 10 mL

Distilled water

Paper towels

Your Bundle Options:

Option 1:

Biology Starter Sensor Bundle

(PS-2920)

A sensor bundle specifically designed to get you started using probeware in your biology lab. Also: perform 10 of the 24 Lab Activities from Biology with Inquiry.

Option 2:

Biology Standard Sensor Bundle

(PS-2925A)

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.