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

Explanation

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 tetra-iodide. `(TiI_(4))`.The impurities are left behind,as they do not react with iodine.
`Ti_((s))+2I_(2)toTiI_(4)`(vapour)
The volatile titanium tetraiodide vapour is passed over a tungsten filament at a temprature around 1800 K.The titanium is decomposed and pure titanium is deposited on the filament.The iodine is reused.
`TiI_(4)(Vapour)toTi_(s)+2I_(2(s))`