Lab 4 Diffusion and Osmosis Essay

1. Diffusion and Osmosis, June 4, 20132. Purpose The purpose of this science lab is to help give visual understanding of scattering which is a issue of high parsimony impromptu (no energy required) moving to an area of low ingress. Also taking a look at osmosis, which is the cause of chemicals across the cell membrane. Osmosis requires some type of energy to be put in for this to happen. After these experiments we should rush a better idea and visualization of how chemicals transfer across the cell membrane.3. MaterialsDropper bottle of urine supplyCompound microscopeDissecting needleCarmine powderSlide and coverslip3 test providesTransfer pipets2 cd ml beaker30 cm moist dialysis tubing500ml beakerHot plateBenedicts reagentI2KI solution starch solutionWax pencil30% glucose solutionString or rubber bandTest tube rackSlides and cover plates4. Methods and ProceduresExperiment 1Prepare a slide of dry carmine and water and cover slip Put under the microscope, examine under th e dissimilar magnifications, record you findings to later suffice up your conclusion. Experiment 2 Use dialysis tubing that has been soaking in water, fold it accordion look and use string to close the ends like a groundwork. Roll opposite end of foot process it opens and add 4 pipettes of 30% glucose into it. Add 4 pipettes of starch solution into it.Mix contents with bag closed. Then rinse with tap water. Add 300 mL of water to a 400- to 500- ml. add a few drops of solution till it turns an amber-yellow air. Leave bag in beaker for 30 minutes.Remove bag and then let it dry.Record observations.Experiment 3Obtain 7 equal size bore ambuscade cylinder from the white potato vine, cut roughly to the same size record the length and weight of each qualification sure they remain order. Next is to collect 7 cups filled with 100 ml of the 6 different concentrations of glucose (, 0.1 0.2, 0.3, 0.4, 0.5, 0.6, and water). Record the time and submerge the potato cylinders in the solut ions. Let them sit for an hour and half before go past removing, weighting and recording the final weight.5. Observations and dataExperiment 1Carmine powder observation accomplishment is random, looks like continuous vibrations Experiment 2Table 1Benedicts TestTest final colorBefore heat of Benedicts testAfter heat Final ColorWater (control)Clear blow blueBlueBagSlight yellowBaby blueYellowish greenBeaker luckyBaby blueOrange/pinkAfter letting the bag sit inside the privy for 30 minutes the solution inside the bag went from a clear color to a delicate yellow color. And by and by the final results of benedicts test I can conclude the carbohydrates did move from inside the bag out.My observation concerning the size of the potato cylinder in the glucose decreased as the concentration of glucose increased and the potato in water remained the same size. 6. ConclusionThe carmine powder experiment proved the theory of distribution because with no energy required you can see the movem ent of particles under a microscope. Again diffusion is the movement of molecules from high concentration to low concentration with no energy required. On the other hand the experiment concerning osmosis were the dialysis bag and the saturation of the potato. Both experiments demonstrated the movement of sugar or water across a cell membrane. On the dialysis bag experiment we could see the slight color change as the IKI did move across the membrane in to the bag but the big surprise was see that after the benedicts test how strong the sugar content was in the beaker solution.Lastly the potato experiment demonstrated through the change in weight how water could pass through the membrane. As we saw the greater concentration of glucose the more shriveled the potato got, indicating the water inside the potato exited out trying to make the concentration equal. The solution containing strictly water made the potato swell as if the concentration inside was start out than the concentratio n outside.