A student investigated the rate of osmosis using dialysis tubing (Visking tubing) sacs filled with sucrose solution.
Each sac was placed into a beaker of distilled water for 45 minutes.
Before weighing the sacs at the end of the 45-minute period, the student carefully wiped the exterior of each Visking tubing sac with a dry paper towel.
Explain why it was necessary to wipe the exterior of the Visking tubing sacs before measuring their final mass.
