Which of the following statements is true?
A. When a liquid mixture is termed “stable”, it means that it will exist in a single liquid phase and not phase split into two phases.
B. If a liquid mixture is not stable, there is no temperature where it will be stable.
C. All liquid mixtures will possess either a LCST, a UCST or, in some instances, both.
D. All of the above are true.
E. None of the above are true.
A. Correct. Instability in a mixture indicates it will separate into two liquid phases.
B. Incorrect. For example, in Figure 13-1 at 325 K the mixture is stable, but at 300 K the mixture is not stable.
C. Incorrect. Mixtures can be completely stable and possess no miscibility gap and, hence, no critical solution temperature.
D. Incorrect. At least one of the statements is false.
E. Incorrect. At least one of the statements is true.
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