Which method of purification is represented by the equation :(impure)Ti + 2I2 →500k TiI4 → 1675k Ti + 2I2 pure
Correct answer: C. Van Arkel
- A. Cupellation
- B. Poling
- C. Van Arkel
- D. Zone refining
Explanation
The equation given involves the purification of titanium (Ti) using the Van Arkel process, which is also sometimes referred to as the iodide process. In this process, an impure sample of titanium is reacted with iodine (I2) to form titanium tetraiodide (TiI4) at a relatively low temperature (500 K). The titanium tetraiodide is then heated to a higher temperature (1675 K), causing it to decompose back into titanium and iodine. The titanium produced is now in a purified form, as the impurities remain in the titanium tetraiodide and are separated from the final product.
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