超声波辅助测定I_3^-I^-+I_2平衡常数实验的微型化  

Micro Experiment of Ultrasonic-Assisted Determination of Equilibrium Constant of I_3^-I^-+I_2

作　　者：张晔[1] 王芳 ZHANG Ye;WANG Fang(Department of Chemistry and Chemical Engineering,Chifeng University,Chifeng 024000,China;Chifeng Building Engineering School,Chifeng 024000,China)

机构地区：[1]赤峰学院化学化工学院,内蒙古赤峰024000 [2]赤峰建设工程学院,内蒙古赤峰024000

出　　处：《化学教育（中英文）》2018年第18期35-37,共3页Chinese Journal of Chemical Education

基　　金：内蒙古自治区高等学校科学研究重点项目“具有高迁移率的有机硼有机发光二极管材料的分子设计与性能研究”(NJZZ235)

摘　　要："测定I_3^-I^-+I_2平衡常数"是大学无机化学实验课的实验之一,该实验中使用了较多的碘,分散振荡时间较长,导致残留的碘挥发到空气中给环境和人体带来危害。为此对该实验进行了改进,利用超声波辅助分散减少分散时间,用微量代替常量减少试剂用量。经过多次重复实验,在超声波辅助分散5min,降低试剂用量90%的情况下,测得平衡常数为1.54×10^(-3),相对误差为2.67%,证明该方法完全可以替代现有的实验方法。＂Determination of equilibrium constant of I-3→←I-＋I2＂ is an important inorganic chemistry experiment in college study. Conventionally, a large amount of iodine was required to finish this experiment with a long dispersion shaking process. Thus, residual iodine volatilized in- to the air and is harmful to the environment and the researchers. In this work, we successfully shortened the dispersion shaking time using ultrasonic-assisted method and saved 90% of the nec- essary reagents. After 5 minutes＇ dispersion, the calculated equilibrium constant was 1.54×10-3 and the relative error was 2.67%. Our results indicated that this novel method could be a poten- tial optimization to current experiment.

关 键 词：常量 微量 超声波 平衡常数 

分 类 号：O61-4[理学—无机化学] G642.423[理学—化学]