University Chemistry ›› 2022, Vol. 37 ›› Issue (9): 2112007.doi: 10.3866/PKU.DXHX202112007

Special Issue: 化学科普(2022)

• Science Education • Previous Articles     Next Articles

Growth of Beautiful Tin Crystals

Yunyi Luo, Wei Deng, Zhenghao Zhang, Rui Wang, Donglin Wang()   

  • Received:2021-12-01 Accepted:2022-04-02 Published:2022-04-29
  • Contact: Donglin Wang


In this study, a convenient and interactive tin electrolysis device was developed for science popularization based on science demonstration technology. After switching on the experimental device, participants can directly observe the rapid growth of tin crystals in the electrolyte at the cathode and the occurrence of many bubbles and color changes in the solution at the anode. Thus, they can experience the beauty and fun of chemistry. The speed of tin crystal precipitation can be changed by adjusting the voltage of the DC power supply, and the current direction can be changed by the current direction switch. A LED display shows the current direction so that participants can intuitively understand its influence on the direction of tin crystal precipitation and the color changes in the anode solution. Participants can also easily understand the basic principles of electrolysis. After the tin crystal growth is completed, AB glue is added, fixing the beautiful tin crystals from electrolysis as a pendant or as another decorative element to be kept as a souvenir. This forms good memories for participants and achieves a good science popularization effect. The equipment used in this experiment is simple, and the cost is low. It can also be used as a basic experimental project in the general chemistry course at the university level or as an exploration experiment for senior high school students.

Key words: Popularization of science, Tin, Electrolysis


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