Osmosis And Diffusion

Osmosis is the diffusion of a solvent across a selectively permeable membrane that occurs in response to differences in solute concentrations (Allen and Harper 2014).Osmosis can fall under the category of passive transport which does not require energy. With osmosis being a type of diffusion it is viewed as molecules moving from a high concentration to a low concentration. To further explain if there is a low water concentration, high amounts of solutes will be present. Water will most likely move to areas where the solute concentration is high, which demonstrates why there would be less water concentration. When conducting the osmosis lab, the initial tonicity of the cell was 0 grams. The beginning weight of the cell was 18.75 grams and
Factors that affect diffusion are temperature, concentration, mass, solubility, density, surface area and thickness of the plasma membrane. The higher the temperature, the faster molecules will diffuse. A low concentration will also allow molecules to diffuse more rapidly. When associating diffusion of molecules with solubility, lipid soluble material will pass more easily through the plasma membrane than polar material, which will allow the molecules to diffuse at a faster rate. Density and diffusion are inversely related. When the plasma membranes surface area is increased it slows the rate of diffusion and vice
To test diffusion in a liquid, take two flasks and set them at different temperatures. To accomplish the temperature difference, one flask can be placed on ice and one should be left at room temperature. The flask should be placed on ice for about fifteen minutes until the water temperature is equal to the ice bath temperature. To indicate the rate of diffusion one milliliter of dye solution can be placed in each flask. Over period of one hour the colder flask will result in slower diffusion that the flask at room temperate. This experiment accurately supports that at higher temperatures molecules will diffuse faster. Diffusion in a gas can be tested by spraying a scent. However long it takes a person to smell the scent is the diffusion rate. Diffusion rate is measured in meters per second. A factor that may affect diffusion in a gas is a vent causing turbulence which may affect the rate at which the molecules