Abstract The determination of the composition and formation constant of cerium(Ⅳ)-ethanol complex is one of the classic physical chemistry experiments.In light of the issues identified in experimental teaching,the influences of the excess amount of ethanol,the extrapolation method for initial absorbance,and the nitric acid concentration on the experiment were further discussed based on the original experiment.The results demonstrated that moderately increasing the excess level of ethanol enhanced the accuracy of experimental data,while employing a linear extrapolation of absorbance versus time to determine the initial absorbance proved more straightforward and rational.Furthermore,moderately reducing the nitric acid concentration still satisfied the experimental requirements.Based on these findings,improvements to the original experimental protocol were proposed.
REN Shi-Tong, SUN Xiu-Guo, DU Yong-Gang. Discussion and Improvement on Determination of Composition and Formation Constant of Cerium(Ⅳ)-Ethanol Complex[J]. Chinese Journal of Chemical Education, 2025, 46(20): 62-69.
