February 2012
AIM : To use vinegar-softened bollock, or gristly eggs, as a cell model to spy osmosis effects. Focused Research Question : How will increase dough concentrations affect the dimensions of the rubbery eggs ? Hypothesis : If the rubbery eggs are a good cellular model, then increasing external chou concentrations should cause more osmosis of piss bug out of these eggs. Predictions : Egg size should decrease the most in the solutions with the higher(prenominal)est sugar concentration. Eggs might also take in water (and grow in size) in the absence of external solutes (plain water). reason Information Osmosis is the passive diffusion of water through a semi-permeable membrane. Water moves down its concentration gradient, toward equilibrium, depending on the relative marrow of solute inside and outside. The greater the solute concentration, the lower the water potential. Water moves by osmosis down this water potential gradient (toward the area of high solute concentration).
Experimental Variables Independent Variable : sugar concentration open Variable : mass and circumference of the eggs Fixed Variables : volume of solutions, temperature of solutions, time of incubation (all are kept constant) Control : rubbery egg, allowed to re-harden and then put into water Materials and Methods : Eggs Large beakers vinegar Water Sugar syrup (100% syrup : 1Kg sugar per liter water) Scale, string, ruler, Refrigerator 1) vizor egg circumference (with string and ruler, eagle-eyed dimension) and bidt. Record results. 2) Soften the eggshells by putting the eggs in vinegar, a weak acid which dissolves the calcium carbonate of the shell, purgative carbon dioxide. This and all subsequent incubations were performed at 4oC (in the refrigerator). 3) Measure and weigh the eggs again (24h later), incubating them subsequently in the different solutions (100% syrup, 50% syrup, and plain water), 3 eggs in each condition. 4) Measure sizes...If you want to get a full essay, order it on our website: Orderessay
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