By substituting CA1 CAXA1 PA1RT CA2 PA2RT andXmln PmlJP so that

caxa

Diffusion in Liquids

Diffusion in liquids can be observed when a drop of food color, for example, is put into a cup of water. The color diffuses into the surrounding water due to the concentration difference until a homogeneous solution is formed. The mechanism of diffusion in liquids is similar to that of diffusion in gases. However, because liquids are denser than gases, the resistance to diffusion in a liquid is much greater and the diffusion rates are lower. Because liquids are incompressible, the total pressure has very little influence on the diffusion. In addition, because concentration in liquids is considerably higher and some chemical changes of the solute may occur, diffusion is often concentration dependent.

The general equation 8, derived for diffusion in gases, can be directly adopted here. Substituting^ from equation 1 gives

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