Q
why do dyes diffuse slower after time
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Dyes diffuse through a medium (e.g., water) due to the random motion of molecules, a process driven by concentration gradients. Initially, when a drop of dye is introduced into a solvent, the concentration gradient between the dye and the solvent is very steep, enabling faster diffusion. As time passes, the dye molecules spread out, and the concentration gradient becomes less steep. This reduction in gradient reduces the force driving the diffusion process, causing it to slow down. Additionally, as dye molecules spread apart, their chance encounters with solvent molecules decrease on a localized scale, further slowing diffusion. Other factors, such as the increase in viscosity of the solution over time due to temperature changes or reactions between dye and solvent, could also contribute to the decreased rate of diffusion.
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