C-ell Structure and Functiondextran solution and place that in the funnel as in demonstration l, and then place thefunnel in the beaker containing just the 20 nl of pure water, in time we will see liquidrise in the stem of the funnel. But remember, we started out with equal volumes of waterin each beaker, i.e. 20m1, so there were equal numbers of water molecules on both sidesof 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 theaddition of a solute, i.e. dextran, to water changes the behavior of the water molecules inthe solution. How can we test this possibility?A second possible explanation for osmosis may be that water molecules in thedextran solution within the funnel are less energized than those in pure water in thebeaker and, therdorc, more water molecules fronr the outside enter the funnel than leaveat any time.
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