Iron(II) chloride (melting point 677C) and potassium chloride (melting point 776C) form

Chapter 6, Problem 6.10

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Iron(II) chloride (melting point 677C) and potassium chloride (melting point 776C) form the compounds KFeCl3 and K2FeCl4 at elevated temperatures. KFeCl3 melts congruently at 380C and K2FeCl4 melts incongruently at 399C. Eutectics are formed with compositions x = 0.38 (melting point 351C) and x = 0.54 (melting point 393C), where x is the mole fraction of FeCl2. The KCl solubility curve intersects the K2FeCl4 curve at x = 0.34. Sketch the phase diagram. State the phases that are in equilibrium when a mixture of composition x = 0.36 is cooled from 400Cto 300C.

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