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Ideal Solution Approximation

Assumes that the interactions between solute and solvent molecules are identical to those between solute-solute and solvent-solvent molecules.

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The statement of the theorem

Define the activity coefficient

\gamma_i

for component

i

in a solution such that, under the ideal approximation,

\gamma_i = 1

. Consequently, the chemical potential

\mu_i

is given by: \n

\mu_i = \mu_i^0 + R T \ln(x_i)

\nwhere

\mu_i^0

is the standard chemical potential,

R

is the universal gas constant,

T

is the absolute temperature, and

x_i

is the mole fraction of component

i

Source: Wikipedia