Difffusion is a process where a substance moves from an
area of greater concentration to an area of lesser concentration. A good example is
perfume being released into the air. As the perfume molecules move about into the air
they go from a great concentration right where they were released to a much lower
concentration throughout the air.
In the example you have
given the small amount of copper sulfate when placed into the water first has to become
dissolved - where the solid goes into solution. Initially this will result in a
relatively deep blue color at the bottom of the
beakers.
What then determines the rate of diffusion is how
fast the molecules are moving in the solution. Since molecules move faster at a higher
temperature, the beaker which has the highest temperature will see the fastest
diffusion and the beaker at the lowest temperature will take the longest to
diffuse.
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