Abstract In this paper, a series of visualized micro experiments based on a macro lens were designed as an example of the double hydrolysis reaction between sodium bicarbonate, sodium carbonate, and aluminum sulfate. The results show that the difference in dissolution rates between the two sodium salts can be clearly observed under the macro lens, and the physical state of the reactants significantly affects their hydrolysis reactions. The “solid-solid” reaction is more suitable for observing the dissolution behavior of the two sodium salts and the dynamic process of their double hydrolysis reaction; the “solid-liquid” reaction is more intense, making it easier to compare and reflect that the hydrolysis reaction of sodium bicarbonate is faster than that of sodium carbonate; the “liquid-liquid” reaction produces a more homogeneous precipitate. In all three types of reactions, the formation of precipitate followed by gas evolution can be observed during the double hydrolysis of sodium carbonate, whereas sodium bicarbonate produces precipitate and gas simultaneously. The improved experiment is characterized by visualization, miniaturization, and strong comparability.
LIU Man, PENG Zhong-Hua, ZHOU Hong-Yu, YANG Cai-Li, LIU Qian, YANG Li-Jun. Experimental Inquiry on Visualization of Double Hydrolysis Reaction Between Sodium Carbonate/Sodium Bicarbonate and Aluminum Sulfate[J]. Chinese Journal of Chemical Education, 2025, 46(23): 94-100.
