Osmosis and Diffusion
Osmosis and Diffusion
During the past few weeks in my Ag Biology class we have been learning about and reviewing both osmosis and diffusion. We did two different labs, one on osmosis; the other on diffusion.
The first lab we did was our diffusion lab. We learned that diffusion is moving something from an area of high concentration to a low concentration. We were showed that Mio and other flavor drops perform diffusion when put in water as an example. For the lab part we put a mixture of starch and water into a plastic Ziploc bag and submerging it into a solution of water and iodine. The bag was semi-permeable and so some of the iodine leaked through into the bag showing osmosis. The iodine, being the indicator, changed the color of the starch mixture to have streaks of light gray with a purple tint almost. We also learned that molecules tend to move from areas of high concentration to areas of low concentration, also known as the Passive Transport.
The next lab we did was our osmosis lab, which we called “Observing Osmosis”. Before we started our procedure, we had to write down our hypothesis for what we think the mass/volume would be and so on. On the first day, Friday, in the lab we took a graduated cylinder and filled it with 250ml of vinegar before pouring it into a beaker with an egg inside of it and covering it with saran wrap to let it sit out for two days. On Monday we drained the vinegar from the beaker, leaving the egg in it, and measured how much was not soaked into the egg. We recorded the results along with our observations. Then we rinsed off the egg and weighed it before putting it back in the beaker and smothering it in 250ml of corn syrup only to be suffocated with a saran wrap ceiling again. On Wednesday we recorded our observations of what the corn syrup did to the egg along with the amount of corn syrup that there was left. Then we rinsed the egg off and weighed it yet again. Then we had to measure a whooping 250ml of clear flat water
During the past few weeks in my Ag Biology class we have been learning about and reviewing both osmosis and diffusion. We did two different labs, one on osmosis; the other on diffusion.
The first lab we did was our diffusion lab. We learned that diffusion is moving something from an area of high concentration to a low concentration. We were showed that Mio and other flavor drops perform diffusion when put in water as an example. For the lab part we put a mixture of starch and water into a plastic Ziploc bag and submerging it into a solution of water and iodine. The bag was semi-permeable and so some of the iodine leaked through into the bag showing osmosis. The iodine, being the indicator, changed the color of the starch mixture to have streaks of light gray with a purple tint almost. We also learned that molecules tend to move from areas of high concentration to areas of low concentration, also known as the Passive Transport.
The next lab we did was our osmosis lab, which we called “Observing Osmosis”. Before we started our procedure, we had to write down our hypothesis for what we think the mass/volume would be and so on. On the first day, Friday, in the lab we took a graduated cylinder and filled it with 250ml of vinegar before pouring it into a beaker with an egg inside of it and covering it with saran wrap to let it sit out for two days. On Monday we drained the vinegar from the beaker, leaving the egg in it, and measured how much was not soaked into the egg. We recorded the results along with our observations. Then we rinsed off the egg and weighed it before putting it back in the beaker and smothering it in 250ml of corn syrup only to be suffocated with a saran wrap ceiling again. On Wednesday we recorded our observations of what the corn syrup did to the egg along with the amount of corn syrup that there was left. Then we rinsed the egg off and weighed it yet again. Then we had to measure a whooping 250ml of clear flat water