Essay Question Osmosis

The mass difference was calculated and then using the equation: Percent change in mass = Final Mass – Initial Mass/Initial Mass x 100.

The individual and the class average of the percent change in mass were then graphed.

The dialysis bag was then submerged into the beaker of solution and left to stand for about 30 minutes (or until there was a color change in the dialysis bag or beaker).

Once the bag was done soaking in the beaker, the final color of the solution in the bag and the beaker was recorded.

A 30 cm piece of 2.5 cm dialysis that has been soaked in water was obtained.

The beginning of tubing was tied off, forming a bag with an open end that was rubbed between the fingers till separated.

Distilled water was poured into a 250 m L beaker (two-thirds of a cup) with about 4m L of Lugol’s solution (IKI).

The color of the sucrose in the beaker was recorded and was tested for glucose.

By testing the beaker for the existence of glucose, it was found that the glucose permeated through the dialysis bag, mixing with the IKI and H2O in the beaker.

This is possible because as stated osmosis is a branched off form of diffusion, in which it is the diffusion of water through a selectively permeable membrane and glucose is one of the substance that is able to go through.


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