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For an ideal liquid solution, which of the following is unity?
Answer & Solution
Correct Answer:
Option
C
For an ideal liquid solution the activity coefficient will be equal to 1. Since, activity coefficient of a species is defined as
\[{{\gamma }_{i}}=\frac{\text{fugacity of the species in the real solution}\left( \widetilde{{{f}_{l}}} \right)}{\text{fugacity of the species in the ideal solution}\left( \widetilde{{{f}_{l}}^{ld}} \right)}\]
For ideal solution \[\widetilde{{{f}_{l}}}=\widetilde{{{f}_{l}}^{ld}}\]
\[{\rm{So, }}{\gamma _i} = 1\]
\[{{\gamma }_{i}}=\frac{\text{fugacity of the species in the real solution}\left( \widetilde{{{f}_{l}}} \right)}{\text{fugacity of the species in the ideal solution}\left( \widetilde{{{f}_{l}}^{ld}} \right)}\]
For ideal solution \[\widetilde{{{f}_{l}}}=\widetilde{{{f}_{l}}^{ld}}\]
\[{\rm{So, }}{\gamma _i} = 1\]
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