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Diagram of solubility of two partially mixed fluids. P3030501

You can get the concept of:
Binary system, the mixing zone, line of communication, critical temperature of solubility.

Principle:
Prepare and preheat a certain amount of mixture of phenol and water until mixed. Upon cooling, the mixture formed two phases of the system, appears blurred. The distribution curve represents the dependence of temperature on the composition of the mixture.