Sublimation
Sublimation means substance directly converted in gaseous form.
Those substances convert in gaseous form this is called as sublimate.
Sublimation is also one kind of separation technique which we can use to separate solid-solid homogeneous mixture which is difficult to separate from one another.
In that mixture, one has property to sublimate so one compound or substance easily separate and another will remaining in dish.
Like we take example, mixture of ammonium chloride (NH4Cl) and sodium chloride (Nacl)
Both are white in appearance. We are unable to separate them from one another. In this situation sublimation process is used.
Sublimation can automatically performing process but if we want to separate this earlier then the heating is helpful in it.
At the time of heating substance is starting sublimating. In that mixture ammonium chloride is sublimating agent so it starts evaporating.
We can use glass cover of funnel on mixture when we heating that mixture it will help to block this gas and convert in powdery form.
After the completing process common salt is present in dish and evaporating gas is stick on glass funnel.
Like this way sublimation process can separate ammonium chloride and sodium chloride.
Question 1) Give some common examples of sublimation.
Answer- Dry ice, Naphthalene balls, Ammonium chloride, Iodine, Camphor, etc.
Question 2) Can powder sugar is separated from ammonium chloride?
Answer- yes, ammonium chloride can sublimate and powder sugar is left behind in dish.
Question 3) identify odd one out
Camphor, Sand, Iodine, Dry ice.
Answer- Sand. Remaining are sublimating agent.