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Reviewed CSCA Chemistry question · Standard

要从氯化钠和单质碘的混合物中分离出碘,最合适的实验方法是?

  1. 过滤
  2. 蒸发结晶
  3. 升华
  4. 分液
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Correct answer

C. 升华

Principle or equation

利用物质物理性质的差异进行分离。碘易升华,加热时由固态直接变为气态,冷却后凝华。

Why this answer is correct

碘具有升华性,加热混合物,碘升华后遇冷凝结,与氯化钠分离。过滤用于分离不溶性固体和液体;蒸发结晶用于从溶液中获得溶质;分液用于分离互不相溶的液体。

Example

分离碘和沙子的混合物可用升华法。

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