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The transition temperature of a hydrated salt is the temperature at which

  • A.one hydrate changes reversibly into another
  • B.the salt melts to a clear liquid
  • C.the salt loses all of its water of crystallisation
  • D.the salt's solubility becomes independent of temperature

Answer: A

Sodium sulphate decahydrate converts to the anhydrous salt at 32.4 degrees, and the sharpness of the change makes such systems useful as fixed points for calibrating thermometers. Three phases coexist there, so the point is invariant.

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