Explain the method to purify Titanium metal.###Explain Van-Arkel … - Vidyadip

Question

Explain the method to purify Titanium metal.###Explain Van-Arkel method for refining Titanium.###How will you purify metals by using iodine?

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Answer

This method is based on the thermal decomposition of metal compounds which lead to the formation of pure metals. Titanium and zirconium can be purified using this method. For example, the impure titanium metal is heated in an evacuated vessel with iodine at a temperature of 550 K to form the volatile titanium tetra-iodide. $\left( Til _4\right.$ ). The impurities are left behind, as they do not react with iodine.
$Ti_{(s)}+2 I_{2(s)} \rightarrow Tii_4 \text { (vapour) }$
The volatile titanium tetraiodide vapour is passeld over a tungsten filament at a temperature around 1800 K . The titanium tetraiodide is decomposed and pure titanium is deposited on the filament. The iodine is reused.
$Til_4 \text { (vapour) } \rightarrow Ti_{(s)}+2 I_{2(s)}$

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