Which of the following statements about liquid-liquid equilibrium is true?
A. Binary mixtures of water + alcohols will not exhibit phase splitting since both compounds can hydrogen bond.
B. A liquid mixture will exhibit a miscibility gap in order to maximize the overall system Gibbs free energy.
C. Owing to the nature of LLE, the UCST or the LCST will occur for a binary mixture when the composition is equimolar.
D. A plot of the molar Gibbs free energy of mixing of a binary mixture as function of the mole fraction of one of the components needs to be concave up over the entire composition range in order for the mixture to exhibit a miscibility gap.
E. None of the above are true.
A. Incorrect. Binary mixtures of water with larger alcohols (such as 1-butanol) will exhibit miscibility gaps.
B. Incorrect. The mixture moves to minimize the Gibbs free energy at equilibrium, not maximize it.
C. Incorrect. This may appear to be the case for some systems, but it is not true (in general).
D. Incorrect. It must have a region where the curve is concave down to possess a miscibility gap. See Figure 13-6 and its interpretation and try again.
E. Correct. All are false.
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