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CBSE Video lectures for download


=Substance and Type of Substances

=Mixture, Homogeneous Mixtures, Heterogeneous mixtures

=Solution, Properties of Solution

=Suspension, Properties of Suspension

=Colloid, Properties of Colloid

=Tyndall Effect

=Method of Separating the Component of Mixture

=obtain the coloured component (dye) from a ink

=Use of separating funnel




=Method of Simple Distillation

=Method of Fractional Distillation

=Obtain Different Gases from Air

=Crystallisation, Application of Crystallisation

=Physical Change

=Chemical Change

=Diagram of water purification system

=Differentiate between mixtures and compounds.

=Classification table of matter.


How can we obtain the coloured component (dye) from a ink?

How can we obtain the coloured component (dye) from a ink?
Answer: Put a watch glass on the mouth of the beaker as shown in the given figure. 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.
Now we will observe that the water get evaporated from the watch glass and residue is left in the watch glass. This residue is the coloured component (Dye). In this way evaporation can used to obtain volatile component from its solution.

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How can we obtain the coloured component (dye) from a ink?

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