Identify the formula and melting point of hydrate, Chemistry

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Identify the formula and melting point of hydrate?

Iron (III) chloride forms various solid hydrates, all of which melt congruently. Table lists the temperatures t of aqueous solutions of various compositions that are saturated with respect to a solid phase.

Table: Temperatures of saturated solutions of aqueous iron(III) chloride at p =1 bar (A = FeCl3, B = H2O)

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(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 = 70.0°C and zA = 0.100

2. t = 50.0°C and zA = 0:275


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