Rapid Formation of Copper Patinas: A Simple Chemical Demonstration of Why the Statue of Liberty Is Green,Journal of Chemical Education

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Rapid Formation of Copper Patinas: A Simple Chemical Demonstration of Why the Statue of Liberty Is Green
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2020-07-01 , DOI: 10.1021/acs.jchemed.0c00417
Thomas S. Kuntzleman ₁ , Deanna M. Cullen ₂ , Scott Milam ₃ , Doug Ragan ₄

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Copper metal is slowly oxidized when it is exposed to the atmosphere for long periods of time, forming a blue-green coating called a patina. For example, the green color of the Statue of Liberty is a result of patina formation. A wide variety of Cu²⁺ compounds are found in patinas, and they generally take long periods of time to develop. Here, an activity is presented in which patinas are rapidly generated on the surface of copper-containing coins. The process can be carried out using very simple materials, making this activity suitable for a wide range of audiences, and also for courses offered in an online format. Because the development of the patina occurs within tens of seconds, the experiment can be presented as an in-class demonstration. Given the vast number of conditions that can be varied in this activity, it is highly amenable to exploratory learning exercises.

中文翻译：

快速形成铜制古铜色：简单的化学论证为何自由女神像是绿色的

长时间暴露在大气中的铜金属会缓慢氧化，形成蓝绿色涂层，称为铜绿。例如，自由女神像的绿色是古铜色形成的结果。多种Cu ²⁺化合物存在于古铜色中，通常需要很长时间才能形成。在此，提出了一种在含铜硬币的表面上迅速产生铜绿的活动。该过程可以使用非常简单的材料进行，从而使该活动适合广泛的受众，也适用于以在线格式提供的课程。由于铜绿的发展发生在数十秒之内，因此该实验可以作为课堂演示来呈现。鉴于这项活动可以改变的条件很多，因此高度适合探索性学习练习。

更新日期：2020-08-11

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