Jonel Santo Domingo
Ms. Johnson – Period 6
AP Biology
Osmosis Lab Report
Objectives -The objective of lab was to experience and observe the process of osmosis using a dialysis
tubing. Throughout the lab, the concentration of various sucrose solutions deeply affected the results of
the experiment; the water inside the tubes varied with each solution.
Materials/Methods – Several plastic tubes were filled with a solutions of varying amounts of sucrose
solute. An electronic scale was used to measure the mass of the tubes before and after the 30 minutes.
-Refer to Lab worksheet for instructions and procedure.
Dialysis Tube Data (in % change)
22.5
22
21.5
21
20.5
20
19.5
19
.2 - 1.0 Sucrose
Average Group Mass Change
.2 - 1.0 Sucrose
Average Class Mass Change
Blue – Group Data; Orange – Class Data
Discussion – As more sucrose was added to the water, the dialysis tubes gained more mass through
osmosis. The tubes acted as a emulation of a cell's phospholipid bilayer, simulating the process of
osmosis. Its very hard to measure or see osmosis actually happening in real cells because cells are
microscopic in size. An artificial membrane makes it possible to see the results firsthand with accuracy.
The “cells” in the solution with lots of sucrose absorbed a lot of water