Question
Name the process used to obtain pure solid from its impure sample. Describe the process taking impure sample of sugar as an example.
Solution
The process of crystallization is used to purify a solid from its impurities.
Description of crystallization:
i) Take about 5 gm of a sample of impure sugar dissolved in minimum amount of water.
ii) Filter the impurities. Saturate the solution by heating in a china dish.
iii) when some solid starts appearing.
iv) Cover the solution with filter paper and leave it undisturbed to cool slowly for a day.
The crystals of pure sugar so obtained are separated either by decantation or filtration.
