Which method of purification is represented by the following equation : Ti \left(s\right) + 2 I_{2} \left(g\right) \overset{523 K}{\rightarrow} \left(Til\right)_{4} \left(g\right) \rightarrow_{}^{1700 \textrm{ } K} Ti \left(s\right) + 2 I

Engineering

Chemistry

Van Arkel and Mond Process

Question

Which method of purification is represented by the following equation :

$Ti (s) + 2 I_{2} (g) \overset{523 K}{\to} {Til}_{4} (g) \to_{}^{1700 K} Ti (s) + 2 I_{2} (g)$

Poling

Zone refining

Cupellation

Van Arkel

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This equation represents the Van Arkel method for purifying metals like titanium. It involves two reversible steps:

First, the impure metal (Ti) reacts with iodine vapor at 523K to form a volatile compound (Til₄).

$Ti (s) + 2 I_{2} (g) \overset{523 K}{\to} {Til}_{4} (g)$

Second, this compound decomposes at a higher temperature (1700K), depositing pure metal.

${Til}_{4} (g) \to_{}^{1700 K} Ti (s) + 2 I_{2} (g)$

Final Answer: Van Arkel