The important factor in osmosis is not the number of molecules. instead, it is the number of particles in a given volume of solution. for example, one glucose molecule dissolved in water yields one particle, but one nacl molecule can yield two ions: na+ and cl-. water moves osmotically in response to the total concentration of particles in the solution. if there is a 10% glucose solution on one side of a semipermeable membrane and 5% salt solution on the other side, what will most likely happen to the flow of water?