Question

Refining of zinc and mercury is carried out by using ______ process.

Short answer

Answer: The refining process used for zinc and mercury is the distillation process.

Step-by-step solution

Identify the refining process for zinc and mercury

The refining process used for both zinc and mercury is the distillation process. In this process, impure metals are heated, which causes them to vaporize. The metal vapors are then cooled and condensed back into their liquid form before being collected as purified metals. So, the answer is: Refining of zinc and mercury is carried out by using the distillation process.

Key concepts

Distillation Process

The distillation process is a method employed in purifying substances by taking advantage of differences in boiling points. In the context of refining metals like zinc and mercury, distillation involves heating the impure metal until it vaporizes. This occurs because the metals have a lower boiling point than the impurities.

During this process, the vapors formed from the heated metal are directed into a cooling system. As the vapors cool, they condense, shifting from a gaseous state back to a liquid. The condensate is then collected as pure metal, leaving impurities behind as they typically require higher temperatures to vaporize. This method is particularly effective for metals like zinc and mercury, which vaporize at temperatures lower than most of their impurities.

Zinc Refining

Zinc, a versatile metal used in various industries, often needs refining to improve its purity. The distillation method is particularly suited for zinc because it has a relatively low boiling point compared to many of its impurities.

During the refining process, zinc is heated in retorts or distillation chambers until it reaches its boiling point and vaporizes. Afterward, the zinc vapors are cooled and condensed into pure zinc. High temperature and carefully controlled environment ensure that zinc transitions from its gaseous state to a high-purity metallic form without allowing the contaminants to do the same.

Mercury Refining

Similar to zinc, mercury refining also employs the distillation process due to mercury's low boiling point. This property allows mercury to be easily vaporized at temperatures that do not affect most other substances it may be combined with.

During its refinement process, mercury is heated, and the resulting vapors are allowed to condense in a cool area. Since mercury is a metal that is liquid at room temperature, the condensation process results in pure, liquid mercury. This metal is then often used in various applications such as thermometers and dental amalgams, requiring high levels of purity.

Metal Purification Methods

Metals can be purified using various methods, with the appropriate technique chosen based on the specific metal and the type of impurities present. Common methods include:

• Electrorefining: Employing an electrolytic cell to remove impurities from a metal.
• Zone refining: Involves progressively melting and solidifying a metal to concentrate impurities in one location.
• Chemical purification: Utilizes chemical reactions to remove undesired elements from the metal.
• Magnetic separation: Some metals are separated from impurities using magnetic fields if there is a difference in magnetic properties.

Choosing the right purification method is crucial and based on the melting point, reactivity, and the presence of various impurities within the metal to be refined. Distillation is one of these methods, particularly favored for metals like zinc and mercury.