Discussion
Consider the following statements about the Gibbs-Duhem equation.
1. It can be used to check experimental activity coefficient data for consistency.
2. It relates the composition derivatives of the partial molar properties.
3. It applies only to ideal solutions.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the Gibbs–Duhem equation relates the composition derivatives of the partial molar properties, and because it must be satisfied it serves as a consistency test on measured activity coefficient data. Statement 3 is wrong - it is derived from the fundamental relations and holds for any solution whatever, which is precisely why it can be used as a test of real data.
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