Abstract In copper-silver nitrate replacement reaction, it was usually observed that bright silver separated out on the surface of copper in water medium, but it was difficult to observe the shape of silver crystals. In order to see the morphology of silver crystals more clearly, this paper inquired the morphology and mechanism of silver precipitation under different media, temperature and concentration with agar and water as medium. The results showed that the silver was dendritic in agar and was flaky in solution, and the silver branch became variable and slender with the increase of temperature or the decrease of concentration in solution. The results could be explained by the three-dimensional network structure of agar and the screw dislocation growth mechanism of crystals.
HUANG Xiu-Keng, DING Wei, WANG Zu-Hao. Study on Conditions and Mechanism of Copper-Silver Nitrate Displacement Reaction[J]. Chinese Journal of Chemical Education, 2018, 39(9): 74-76.