As concentration of solute increases, the number of molecular collisions per unit time increases, which leads to a greater rate of solute dispersion away from the concentrated region. Accordingly, in comparing the rate of diffusion for different concentrations of solute, the rates should have increased as the concentration of solute increased. Temperature is a measure of the rate of molecular movement. Increasing the temperature of a solution would increase the frequency of collisions, so the rate of diffusion would increase. The heavier the molecule the slower it moves, so a solute's molecular weight is inversely proportional to its rate of diffusion.
Hydrostatic pressure is the force exerted against a surface by a volume of water.
The magnitude is directly proportional to the volume of water, so the larger funnel would have the largest hydrostatic pressure. As the water and solute are filtered, the volume in the funnel decreases over time. Thus, the hydrostatic pressure gradient decreases over time, so the rate of filtration should also decrease over time. The basis for filtration is molecular size relative to the pore size of the filter paper. This relates to the size of molecules in the plasma component of the blood, relative to the size of the holes between the cells making up the walls of capillaries in the body.