How can a mixture of NHCl and NaCl be separated?  

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Ammonium Chloride, NH4Cl, undergoes sublimation and decomposition at a temperature of about 338 degrees C. It decomposes into NH3 and HCl vapors. Sodium Chloride is stable when heated and has a melting point of 801 degrees C, so heat can be used to separate one from the other.

The procedure...

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Ammonium Chloride, NH4Cl, undergoes sublimation and decomposition at a temperature of about 338 degrees C. It decomposes into NH3 and HCl vapors. Sodium Chloride is stable when heated and has a melting point of 801 degrees C, so heat can be used to separate one from the other.

The procedure for doing this is as follows:

1. Place the sample in a china evaporating dish on a clay triangle or wire mesh supported by a rind stand.

2. Place cotton in the opening of a glass funnel, invert the funnel and place it over the evaporating dish containing the sample.

3. Gently heat the sample using a Bunsen burner or alcohol burner beneath the evaporating dish.

4. Continue heating until white smoke is no longer observed rising from the sample.

5. Allow to cool, then scrape the NH4Cl from the glass funnel if it’s necessary to recover it.

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