The Activity Coefficient
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While we have defined fugacity coefficients of individual species in a liquid solution by 6.153, we may define yet another parameter called activity coefficient in order to describe the non-ideality of a liquid solution, especially at low to moderate system pressure.
We have by eqn. 6.155: ![]() And from eqn. 6.158: ![]() | ||||||||||||||||||||||||
Using the above equations: ![]() | ||||||||||||||||||||||||
The left side of this equation is the partial excess Gibbs energy ![]() ![]() ![]() ![]() | ||||||||||||||||||||||||
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Whence,
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But ![]()
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