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- #General Principles and processes of Isolation Elements
The Van Arkel process is a highly efficient method for the removal of impurities because it utilizes the difference in:
Melting points
Boiling points
Density
Reactivity
Answers (1)
The Van Arkel process is a method used for the purification of zirconium and titanium. It is based on the difference in boiling points between the impurities and the desired metal.
In the Van Arkel process, the impure metal is converted into a volatile compound, usually a metal iodide, through reaction with iodine. The metal iodide is then heated to a temperature at which it vaporizes. The impurities, which have different boiling points than the metal iodide, are left behind as solid residues. The metal iodide vapor is then decomposed, typically by heating it in a heated filament, to obtain the purified metal.
By utilizing the difference in boiling points, the Van Arkel process allows for the separation and removal of impurities from the desired metal. The impurities, which have higher or lower boiling points than the metal iodide, do not vaporize at the same temperature, allowing for their selective removal.
Therefore, the correct option is (2) Boiling points. The Van Arkel process takes advantage of the difference in boiling points between impurities and the desired metal to achieve efficient purification.
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