Notes On Osmosis

Abstract

Osmosis is the movement of water from a higher concentration to a lower concentration across a membrane. Osmosis is considered to be a passive transport because energy is not required in order for water molecules to move in and out. It is semi-permeable and the reason being so is because not all different molecules can enter. It leaves certain solutes out and allows certain ones in. the purpose of this lab is to see how the use of diffusion can allow the osmosis to travel across the membrane. To start off there was a sample bag containing sodium Sulfate (NaSO4), and a big beaker of sodium chloride (NaCl). We placed each in testing tubes containing different solutes which were starch, sulfate ion, chloride ion, and protein and saw how they reacted in terms of osmosis (hypertonic, hypotonic,

In each case the molecules moved from higher water concentration to lower water concentration (bolded words are the answers).

7. Dialysis is a technique used to purify blood in cases of kidney failure. During dialysis what substances would you want to remove from the blood stream? What substances would you want to remain in the blood stream? Hint: you may have to look up how dialysis works online.

Answer is: the materials you would want to remove are of course the unwanted harmful wastes. This is referred towards the substance called Urea. As for the substance you would want to keep is the blood itself. Since that is what is being filtered.

As mentioned in the abstract, osmosis is the movement of water through a permeable membrane. Subdivided there are three specifics of osmosis being isotonic, hypertonic, and hypotonic. Each of which describe the level of water. Through the results the sulfate ions changed color which gave a positive result after incubation. This means that sulfate ion was permeable, and it passed through or diffused successfully. As for the starch it gave a negative result which means the solution didn’t change and solute didn’t