Which method is most suitable for obtaining pure crystals of copper sulfate from its solution?
Crystallization
Crystallisation is a method of obtaining a pure solid in the form of crystals from its solution. The solution is heated to make it saturated, filtered if needed, and then allowed to cool slowly so that pure crystals separate out.
Impurities remain dissolved in the leftover solution, so the crystals obtained are pure. Simple evaporation to dryness is avoided because the blue copper sulfate crystals contain water of crystallisation, which strong heating would drive off, and soluble impurities would also be left behind.
Distillation is used to recover a pure liquid from a solution, filtration separates an insoluble solid from a liquid, and sublimation separates solids such as ammonium chloride, camphor or iodine that change directly into vapour, which copper sulfate does not.
Hence, Crystallization.
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Important Questions from Basic Concepts of Chemistry
Which of the following pair is correct?
I. Isotopes – different mass numbers
II. Isobars – different atomic numbers
Which of the following is a zone of a flame?
I. Dark
II. Luminous
III. Non-Luminous
If formula of sodium salt of an anion X is \(Na_2X\) , then the formula of its aluminium salt would be
Which of the following set contains same number of molecules?
A. 1 gram O 2, 2 grams SO 2
B. 1 gram CO 2, 1 gram N 2O
C. 1 gram O 2, 1 gram O 3
The volume of CO 2liberated at STP when 10 gm of 90% pure limestone strongly heated is
