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124. Solving a chemistry problem
Content: 167.rar 175,2 kB
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167 Based on the given data, construct a melting diagram for the phenol-phenyl salicylate system in the "temperature-composition" coordinates at p = const.
Using the fusibility diagram and, if necessary, performing appropriate constructions, determine: 1. What type does this system belong to? 2. The temperature of the onset of crystallization and the composition of the first crystals that separate from the melt, which has a gross composition of (С6Н5ОН) = 30%. 3. What is the mass of the precipitated crystals during a sharp cooling of this melt to 60ºС, if the mass of the initial melt is 1 kg? 4. What is the number of degrees of freedom of the system with (С6Н5ОН)=30% at 100 0С, 60ºC and 20ºС? 5. Give the form of the cooling curve for the system with (С6Н5ОН) = 30%. Align the "temperature" axis for drawing the cooling curve with the "temperature" axis of the melting curve on the right.
Number Composition of the system (phenol), % Crystallization start temperature, tºС Crystallization end temperature, tºС
10 116 116
2 10 107 24
3 20 96 24
4 40 70 24
5 60 35 24
6 70 28 24
7 90 39 24
8 100 40.6 40.6
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