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IMG_0004_NEW_0002 - C-ell Structure and Function dextran...

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C-ell Structure and Function dextran solution and place that in the funnel as in demonstration l, and then place the funnel in the beaker containing just the 20 nl of pure water, in time we will see liquid rise in the stem of the funnel. But remember, we started out with equal volumes of water in each beaker, i.e. 20m1, so there were equal numbers of water molecules on both sides of the membrane at the start This immediately disproves our first hypothesis - it is oCI* the number of water molecules that causes osmosis. Is it possible, however, that the addition of a solute, i.e. dextran, to water changes the behavior of the water molecules in the solution. How can we test this possibility? A second possible explanation for osmosis may be that water molecules in the dextran solution within the funnel are less energized than those in pure water in the beaker and, therdorc, more water molecules fronr the outside enter the funnel than leave at any time. There is a basic concept in physics called entropy. The
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This note was uploaded on 12/29/2011 for the course MBB 222 taught by Professor Briscoe during the Fall '10 term at Simon Fraser.

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