Osmosis/Diffusion

Topics: Osmosis, Diffusion, Concentration Pages: 3 (917 words) Published: January 23, 2014
Introduction:
Diffusion and osmosis are passive processes of transport. Passive transport involves no disbursement of energy by the cell. Diffusion movement is from high concentration to low concentration, which the driving force for this type of movement is kinetic energy particles themselves. Which crystal (Methylene blue, solid or Potassium Permanganate KMnO4-purple) will move further than the other due to the driving force (kinetic energy)? My prediction is that Potassium Permanganate KMnO4- purple (molecular mass- 158.03 g/mol) will move further than Methylene blue, solid (molecular mass- 319.85 g/mol) since it weighs less.

In osmosis is diffusion of H2O across a selectively permeable membrane (dialysis tubing). There is only movement of water, not solute, across the plasma membrane. Water moves from a solution to a lower solute to prevent a passage of water across an osmosis membrane, which is known as osmotic pressure. Osmotic pressure increases with increasing solute concentrate. What will be the changes of weight when a 10 mL tap water bag is placed into Beaker #1, which is filled to 200 mL of tap water? My prediction is that there will be no change in the weight. Since solutions that contain the same concentrate of solute particles per volume of a solution that than within the cells are said to be isotonic solutions, which means the concentration of a solute particles is the same on both sides . What will be the changes of weight when a 10 mL of 20% sucrose solution bag is placed into a 200 mL beaker of tap water? My prediction is that there will show a weight increase. Solutions that contain a solute concentration less than that within a cell are said to be hypotonic, which means the water moves into cell, fewer solute particles per volume of solution outside than inside . What will be the change of weight when a 10 mL of 40% sucrose solution bag is placed into a 200 mL beaker of tap water? My prediction is that there will show a weight increase....

Citations: Human Anatomy and Physiology I Supplement Laboratory Materials, pg.44 and pg.45, WCCC Biology Department,2013
http://sciweb.hfcc.net/biology/jacobs/bio131/diffusion/diff&os.html, Jacobs, 1998
Human Anatomy & Physiology, McKinley, 2013
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