Three phased equilibrium temperature and pressure. Consider the hypothetical thr

Question

Three phased equilibrium temperature and pressure.

Consider the hypothetical three-phase equilibrium sketched in Figure 2a at temperature Tand pressure P. A solid crystalline solution (i.e. crystal in crystal) of B in A is in contact with an aqueous solution of A(aq) and B(aq), which is in turn in contact with a vapor phase containing A(v) and B(v) in addition to water vapor. Figure 2b is a histogram in which the ordinate scale is Kcal/mol, on which are plotted the absolute chemical potentials of A in the three phases. These absolute potentials may be very large, and we do not know the exact values; so, only the top of the histogram is shown, indicating only relative values of the equilibrium chemical potential (denoted as Ha by the dotted line in the bar for the gas/vapor phase) with respect to the standard-state chemical potential (denoted by superscript 0). You have been given sufficient information to draw similar dotted lines in the bars for where the equilibrium chemical potentials for the liquid phase and the solid phase should be. Draw them! ACN) Temp TC R(s) H2O(v) A(v) B(v) (A.B) Figure 2a Figure 2b

Explanation / Answer

The chemical potential of each species'i' in phase gas (g), aqueous (aq) and solid (s) phase will be same at equilibrium.

?A (g) = ?A (aq) = ?A (s)

Hence, the other line will be similar todotted lines given and shown below:

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