Determining Chemical Equilibrium Constant With the Help of Hand-Held Technology: Taking Fe3+/SCN- Equilibrium System as an Example
LI Lin-Shen1,2, QIAN Yang-Yi1**, CAI Dan-Ju1,3, HUANG Qian-Ying1,4, ZHU Qing1,5
1. College of Chemistry, South China Normal University, Guangzhou 510006, China;
2. Shimen Senior High School, Foshan 528200, China;
3. Nanhai Senior High School, Foshan 528200, China;
4. Guangdong Zhongyuan High School, Guangzhou 511400, China;
5. Shenzhen Xin'an Middle School (Group) Foreign Language School, Shenzhen 518101, China
Abstract Combined with hand-held techniques, the method to determine the equilibrium constant of Fe3++SCN-FeSCN2+ was improved, and became more miniaturized and facilitated. An experimental scheme for the determination of equilibrium constants was provided for high school teaching. The value obtained was K=1.6×102 (experimental conditions: T=(26.5±0.5) ℃,I=0.7,[H+]=0.15 mol/L).
LI Lin-Shen, QIAN Yang-Yi, CAI Dan-Ju, HUANG Qian-Ying, ZHU Qing. Determining Chemical Equilibrium Constant With the Help of Hand-Held Technology: Taking Fe3+/SCN- Equilibrium System as an Example[J]. Chinese Journal of Chemical Education, 2021, 42(19): 87-91.
