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Is Matter Around Us Pure
Give two examples of solutions containing a non-volatile component and a volatile component. How will you obtain non-volatile component from such a solution?
(a) Solution of sugar (non volatile component) in water (volatile component).
(b) Solution of ink (non-volatile component) in water (volatile component).
Non-volatile component from a solution can be obtained by the process of evaporation.
Experiment. Take a beaker half filled with water. Put a china dish or watch glass on the mouth of the beaker. Pour some drops of solution in the watch glass. Heat the beaker. Your will find that water from solution starts evaporating. Continue heating till evaporation goes on and only solid material is left behind. Solid material left behind is the non-volatile component. The volatile component, i.e., water gets evaporated.
Fig. 2.2. Evaporation.
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Which separation techniques will you apply for the separation of the following?
Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
Which separation techniques will you apply for the separation of the following?
Different pigments from an extract of flower petals.
Which separation techniques will you apply for the separation of the following?
Butter from curd.
Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
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