Substance and Type of Substances
Mixture, Homogeneous Mixtures, Heterogeneous mixtures
Solution, Properties of Solution
Suspension, Properties of Suspension
Colloid, Properties of Colloid
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
Diagram of water purification system
Differentiate between mixtures and compounds.
Classification table of matter.
Answer: Chromatography is the technique used for separation of those solutes that dissolve in the same solvent.
To understand how this technique can be used let us perform an activity.
Take a thin strip of filter paper. Draw a line on it using a pencil, approximately 3 cm above the lower edge as shown in figure(a). Put a small drop of ink (water soluble, that is, from a sketch pen or fountain pen) at the centre of the line. Let it dry. Lower the filter paper into a jar/glass/ beaker/test tube containing water so that the drop of ink on the paper is just above the water level, as shown in Fig(b) and leave it undisturbed.
Watch carefully, as the water rises up on the filter paper. Now observe that the coloured component that is more soluble in water, rises faster and in this way colours get separated.
Applications of Chromatography
• colours in a dye
• pigments from natural colours
• drugs from blood.
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