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Discussion

Phenol and water are partially miscible, and their mutual solubility

  • A.decreases with temperature up to a critical value
  • B.is independent of temperature altogether
  • C.is complete at every temperature above freezing
  • D.increases with temperature up to a critical value

Answer: D

Above the upper critical solution temperature of about 66 degrees the two mix in all proportions and the two-layer region disappears. Triethylamine and water behave oppositely, becoming less miscible as they are warmed.

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