A list of techniques used to separate mixdures is given below.
diffusion
fractional
simple
filtration
distillation
crystallization
distillation
From the list choose the most suitable technique to separate the following.
water from aqueous copper(II) sulphate
helium from a mixture of helium and argon
copper(II) sulphate from aqueous copper(II) sulphate
ethanol from aqueous ethanol
[5]
barium sulphate from a mixture of water and barium sulphate
Answers
Answer:
Separating the Components of a Mixture
We have learnt that most of the natural substances are not chemically pure. Different methods of separation are used to get individual components from a mixture. Separation makes it possible to study and use the individual components of a mixture.
Heterogeneous mixtures can be separated into their respective constituents by simple physical methods like handpicking, sieving, filtration that we use in our day-to-day life. Sometimes special techniques have to be used for the separation of the components of a mixture.
How can we separate a solvent from its solute?
Activity 1 : How can we obtain coloured compound (dye) from blue/black ink?
Fill half a beaker with water.
Put a watch glass on the mouth of the beaker
Put few drops of ink on the watch glass.
Now start heating the beaker. We do not want to heat the ink directly. You will see that evaporation is taking place from the watch glass.
Continue heating as the evaporation goes on and stop heating when you do not see any further change on the watch glass.
Observe carefully and record your observations.
Answer:
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