Tag: other methods of separation

Iodine dissolved in alcohol is called tincture of iodine. Alcohol is a volatile liquid. So the mixture can be kept open or warmed in a water bath. Alcohol will evaporate leaving behind the iodine crystals.

There are way in separating mixtures of chloride salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration, and sublimation. The easiest method among the three is separation by sublimation.  Ammonium chloride sublimes upon heating. Actually, the sublimation is a decomposition of ammonium chloride forming ammonia and hydrogen chloride. 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. 

Hence, the correct option is D.

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
To separate mixtures that contain a sublimate with volatile component from a non-sublimate impurity, the sublimation process is used. Ammonium chloride changes directly from solid to gaseous state on heating. The gaseous form of ammonium chloride can be cooled easily to get a pure solid.

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. when heated iodine turns directly to vapours leaving behind the sand particles

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.Sea water on evaporation leads to formation of salt when the liquid gets vaporized and the salt is left behind.

 Sand and iodine can be seperated by the process of sublimation. It is a process in which a solid converts directly into a gas without converting into a liquid.

On heating the mixture of common salt and ammonium chloride in a china dish white fumes evolve and rise inside the funnel the china dish and cover it, to collect the fumes of the sublimating substance.

Sublimation is used for separating substances with on heating change directly into vapour. The vapour by cooling gives the pure substance in & solid form which is called sublimate. Here camphor wil sublime leaving behind the sand.

Sublimation method is used for separating substances which on heating change directly into vapour. Benzoic acid sublimes on heating.

Camphor is separated from NaCl by Sublimation.
On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish.
Note: Sublimation is the process of heating a solid to obtain vapours.
When a mixture of NaCl and camphor is heated, camphor sublimes and its vapours are obtained.
The vapours on cooling (when they come into contact with the inner surface of the inverted funnel ) condense into solid.