Diffusion Lab

The diffusion lab shows molecules moving from areas of higher concentration to lower concentration and then equals out. In scientific term, the molecules move from areas of hypertonic and permeable into an area of hypotonic. Then the hypertonic and the hypotonic become isotonic. In this lab the iodine is the higher concentrated material and is able to go through a plastic baggie membrane because of the bag has been weaken which means dilute. When the iodine goes through the baggie it changes the color of the starch inside of the baggie. Since the iodine changes the starch’s color that means the iodine is an indicator. Now because this experiment is in water it is called osmosis. To predict what will happen is that the iodine will change the color of the starch since the iodine is an indicator. That is a prediction of what may or may not occur while actually conducting a real diffusion lab. To first do a lab their must always be a prediction to help with the experiment.

In the lab there is a half cup of water mixed with starch in a plastic baggie. If there is air in the bag the experiment cannot work. Also there is a half filled beaker with ten drops of iodine inside. Now the baggie with starch goes into the iodine filled water. After fifteen minutes there is a change in color of the starch from a milky white to a slight pink. This is because the iodine is able to pass through the baggies membrane and change the color of the starch since the starch is leaving an area of high concentration to an area of low concentration. In a day or two the iodine and the starch will equal out creating a very dark purple inside of the baggie. And the water around in the beaker would have turned from dark brown to a clear liquid. The lab should be taken with complete care because it can be complicated to do.

There are many ways that diffusion happens in everyone’s daily lives, even if no one notices it. One example is when you put Kool-Aid mixture into water and the Kool-Aid diffuses into the water and spreads from a high concentration to a lower concentration till the Kool-Aid and the water has equaled out. Next, example is when someone sprays cologne in a room. The cologne travels from the original point which is a high concentration and move thought a room and become a lower concentration till it has equaled out with the air. Another example is when you put a lump of sugar in some ones tea. The sugar would dissolve and spread into an area of lower concentration, which is the tea. Once the sugar is completely dissolved the sugar would be equaled out with the tea. Lastly, when someone sets a candle on fire, the smell of the candle moves from a higher concentration to a lower concentration the air and the smell from the candle will equal out. Those are a few examples of how there is diffusion in our daily lives.