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Q. Iron chloride forms various solid hydrates, all of which melt congruently. The temperatures t of aqueous solutions of various compositions that are saturated with respect to a solid phase.
(a) Use these data to construct a t-zB phase diagram for the binary system of FeCl3 (A) and H2O (B). Identify the formula and melting point of each hydrate.
Hint: derive a formula for the mole ratio nB = nA as a function of xA in a binary mixture.
(b) For the following conditions, determine the phase or phases present at equilibrium and the composition of each.
1. t = 70.0C and zA = 0.100
2. t = 50.0C and zA = 0.275
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