摘要
"三氯化六氨合钴(Ⅲ)的制备及其实验式的确定"是基础化学实验中的一个综合实验。该实验以活性炭为催化剂,CoCl_2与氧化剂H_2O_2、过量氨水、NH_4Cl反应制备三氯化六氨合钴(Ⅲ),通过测定产物中的氨、钴、氯含量,求出整数比,从而来确定其实验式。本文对氯的测定方法进行了改进研究,比较了电位滴定法和莫尔法测定产物中氯含量的效果。实验证明电位滴定法精密度高、重现性好、结果更可靠、教学效果更好。
The experiment on preparation and empirical formula determination of hexamine cobalt(Ⅲ) chloride is a comprehensive experiment in the basic chemistry laboratory. The coordination compound was prepared by the reaction of CoCl2 with H2O2 as the oxidant, excess ammonia and NH4Cl with the catalysis of activated carbon. The empirical formula of the product was obtained by taking the integer of the ratio of NH3, Co and Cl based on their contents from titration. In this paper, the titration method of Cl was improved. The Cl contents from the potentiometric titration method and Mohr method were compared. Results show that the potentiometric titration method has the advantages of higher precision, better reproducibility and reliability, as well as the better teaching effect.
作者
王周
石建新
彭敏
郑赛利
李莲云
赖瑢
朱可佳
WANG Zhou;SHI Jianxin;PENG Min;ZHENG Saili;LI Lianyun;LAI Rong;ZHU Kejia(School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,P.R.China.)
出处
《大学化学》
CAS
2019年第2期49-54,共6页
University Chemistry
基金
2017年中山大学校级质量工程项目"重点教材建设项目"
