Egg Osmosis Lab Report

Conclusion

(1) In the osmosis lab I made a few predictions (a) I predicted that the egg in the hypotonic solution will swell & gain mass because, there are more h20 molecules and less solutes in the distilled water then inside the egg therefore the h20 will go into the egg. (b) I predict that the egg in the hypertonic solution will shrink and lose mass because, there are more salt molecule (solution) and less water molecules in the salt than inside the egg therefore the h20 will the egg. (c) I predict that the egg in the isotonic solution will stay the same size & mass because, there will be the same amount of solutes & H2O inside and outside the egg therefore the H2O will go inside & outside the egg. (2) My hypothesis was not supported by

the results. When the egg was placed in the hypotonic solution the egg was supposed to gain mass but it infact shrunk. It had been placed in distilled water, in which distilled water is supposed to cause the egg to swell. Making the starting mass 86 g's and the ending mass 83g’s. Therefore the difference in mass was 3.4%. It also didn’t apply to the hypertonic solution. This solution was supposed to shrink because the egg was placed in a salt solution (the hypertonic). Salt is a grain that basically absorbs the water drying the egg out causing all the mass to be lost. In other words, when I put the egg in the hypertonic solution the egg didn't shrink it in fact gained weight. Making the starting weight 89.5g’s and the end weight 97 g. Therefore the difference in mass was 8.3%. The third solution was an isotonic solution which my prediction states that it wasn't supposed to change in weight. Making my starting mass 89 g's and my ending mass 96.5g’s. This solution isn't supposed to change in mass because the amount of water and the amount solutes were supposed to be perfectly balanced out cause the eggs change in mass to be 0% but My eggs difference in mass was 8.4%. (3) In this experiment my group and I could improve on doing more research and making measurements for each experiment to make perfect solution. Then it would have helped if I could have been there more to help and make sure everything was measured correctly. (4) During osmosis a blood cell can either have a hypertonic, hypotonic, or an isotonic solution. your blood cell is what tells you whether you're dehydrated or hydrated.

So when you drink a lot of water and don't balence it with something salty then you could be potentially over hydrated. with that dehydration is when someone doesn't have enough water and can be very unhealthy. By being dehydrated it can cause muscle cramps and fainting. The egg could also be perfectly balanced with a perfect amount of solutes and h2o in the solution to cause to the egg to not change weight. The egg in the lab is doing the same thing our blood cells do everyday. The egg in the osmosis lab is doing the same actions because the shell around the egg is a form of a cell membrane a stretchy substanse like elastic that can expand to a certain point. With this substance the egg can expand and shrink to whatever point its capable of. When the egg was in the hypertonic solution, it was supposed to shrink, but it had gained mass instead. By that I mean the balance was off there was too much water inside the egg then outside. If there was more water outside the egg, the egg would have shrunk a lot. But water makes the egg expand and gain mass. Therefore In the hypotonic solution the egg was supposed to gain in mass, but instead it decreased in mass. The egg mass didn't have a drastic change, but it still was

supposed gain weight. With that said the egg had less water inside than outside like the hypertonic was supposed to. So why did the egg does that. well the hyper and hypo solutions are just solutions with very specific requirements, they both require water but don't require too much water. The lab would have been better if the solutions were measured correctly. In the isotonic solution the eggs balance was completely off there was way too much water in the solution. The egg was over hydrated it had gained way too much weight. The isotonic solution is what it was supposed to be completely perfect it wasn't supposed to gain or lose weight. (5) Unfortunately I would change all solutions not just one, because all of my solutions were wrong. With the solutions I would change the h20 amount. For example the hypertonic solution has to much water in it causing the egg to swell way to much and making it more of a hypotonic solution. If the water and salt were measured correctly then the osmosis would be properly tested, the salt water (hypertonic) solution would shrink the egg like it was supposed to do. With the other eggs and solutions we need to make sure their the right solution for the right cup and egg.