PASCO ME-6940 Diffusion-Osmosis Apparatus - Manual

® I n s t r u c t i o n M a n u a l
012-10962A
Diffusion-Osmosis Apparatus
ME-6940
800-772-8700 www.pasco.com
*012-10962*
Introduction
Open any biology textbook to the osmosis section and
you will find the image of a U-shaped tube composed of
two clear columns separated by a semi-permeable mem-
brane. (See Figure 1.) This classic figure is the most
commonly used model to visualize the osmotic move-
ment of water due to a concentration gradient. PASCO's
ME-6940 Diffusion-Osmosis Apparatus is a U-shaped
apparatus consisting of two cylinders separated by a
semi-permeable membrane. The transparent, graduated
cylinders allow students to observe and measure volume
changes due to osmosis. In conjunction with the
PASPORT Dual Pressure Sensor, the apparatus allows
students to measure the changes in pressure and volume
caused by the osmotic movement of water across a
semi-permeable membrane. With the use of other sen-
sors like conductivity, pH, carbon dioxide gas or oxygen
gas, students can explore the diffusion of molecules
across the semipermeable membrane.
Sensor
Mounting Stud
Semi-permeable
Membranes (25)
Diffusion-Osmosis
Apparatus
Tubing
Quick-release
Connectors
Caps
Bolts
Bolt
Bolt
Alignment
Tabs
Figure 1