A teacher gave an impure sample of alum containing fine sand as impurity to a student. He asked him to recover pure alum from this sample. The correct procedure to be followed would be to dissolve the impure sample of alum in water, filter and ____ the filtrate.

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Detailed Solution

A teacher gave an impure sample of alum containing fine sand as impurity to a student. He asked him to recover pure alum from this sample. The correct procedure to be followed would be to dissolve the impure sample of alum in water, filter and evaporate the filtrate.
To make pure alum, dissolve impure alum in water and then filter it. The filter paper contains all of the insoluble contaminants. The water is then evaporated, yielding pure alum. The evaporation process turns liquid water into gaseous water (water vapor). Solid particles are separated from liquids in the process of filtration.

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