Question

Which of the following mixtures can be separated by sublimation?
(1) NaCl and KCI
(2) NH4Cl and Nacl
(3) KCl and CaCl2
(4) MgCl2 and CaCl2​

Answer 1

Answer:

I'm going to separate MgCl2 from a electrolyte solution containing MgCl2 (182 g/L), CaCl2 (458 g/l), NaCl (4 g/L), KCl (4g/L). Given that both concentration of MgCl2 and CaCl2 is very high, Is there any suitable method for separation and extraction of both MgCl2 and CaCl2 ?

Answer 2

The process of sublimation can be used to separate a mixture of Sodium chloride and Ammonium chloride.

• Sublimation is a process in which a substance in the solid phase is directly converted to its gaseous phase, without the formation of a liquid phase.
• Among Ammonium chloride and sodium chloride, sodium chloride does not undergo sublimation.
• Ammonium chloride can sublimate when a mixture of NaCl and NH₄Cl is heated, leaving behind pure sodium chloride.
• The sublimed ammonium chloride can be recollected by condensation of the vapors formed.
• Other examples of compounds that can undergo sublimation include camphor and iodine.