Diffusion and Osmosis

Diffusion and Osmosis

Lab Report on Diffusion and Osmosis Our objective is to figure

diffusion and osmosis. Diffusion is the process whereby particles of

liquids, gases, or solids intermingle as the result of their

spontaneous movement caused by thermal agitation and in dissolved

substances move from a region of higher to one of lower concentration.

Osmosis is a process of absorption or diffusion suggestive of the flow

of osmotic action. In our experiment in lab class, we did a procedure

to observe osmosis along a free energy gradient. It was to determine

if the experiment was hypotonic, hypertonic, or isotonic. Our second

experiment was to observe diffusion across a differentially permeable

membrane. It is to figure out movement and reaction of sodium

hydroxide and phenolphthalein through a permeable membrane. In

addition, we also figure the movements and reaction of iodine and

starch in a different beaker.

In our experiment to observe osmosis along a free energy gradient, we

would need to gather all these supplies.

* We would first obtain eight pieces of strings and four pieces of

dialysis tubing that is pre soaked about fifteen cm long. Then we

would seal one end tightly by folding and tying.

* We would have to leave one end open to fill it up with the different

percentages of sucrose.

* In the first dialysis tube (bag A), we would insert ten mL of one

percent sucrose. Bag B we would also insert ten mL of one percent

sucrose. Bag C would be different it contains ten mL of twenty-five

percent sucrose. Bag D has a higher percentage of sucrose of fifty

percent also ten mL. We also label these bags by writing the letters

A-D and place them in the bag.

* After the solution sucrose, which is a disaccharide composed of

glucose and fructose. Is inserted we would tie the ends off.

* Then we would weight the bag and record it in a chart before we put

it in the beaker containing sucrose solution.

* After weighing the dialysis bag and got the initial weight we place