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Question

1. How to separate ammonium chloride + sodium chloride. Explain.

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Solution

  • There are many ways in separating mixtures of chlorides salts such as that of sodium chloride and ammonium chloride.
  • It can be done by crystallization, filtration or sublimation.
  • The easiest method among the three is separation by sublimation.
  • ​ Ammonium chloride sublimes upon heating. Actually, the sublimation(phase transition from direct solid to gas on heating) is a decomposition of ammonium chloride forming ammonia and hydrogen chloride.
  • The reaction can be written as:
  • NH4Cl(s)NH3(g)+HCl(g)
  • Sodium chloride on the other hand doesn't sublime and has a higher melting point than ammonium chloride.
  • If we want to separate the mixture, we have to heat up to 330-350 degrees Celsius and collect the gas that will be produced.


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