多元酸碱滴定条件的本质意义及关系  

The Essence,Significance and Relationship of Polybasic Acid or Polybasic Base Titration Condition

作　　者：刘凯[1] 李玲[1] 段丽丽[1] 

机构地区：[1]内江师范学院化学化工学院,四川内江641199

出　　处：《内江师范学院学报》2014年第12期23-26,共4页Journal of Neijiang Normal University

摘　　要：结合滴定曲线,系统揭示了多元酸碱滴定条件的本质、意义和关系.研究表明:Ki/Ki+1既是分步滴定的决定性因素,也是影响滴定突跃的首要指标;cspiKi是当Ki/Ki+1足够大时,决定突跃大小的关键所在.滴定前的判定程序是:先看被测物的Ki/Ki+1是否大于或等于105,以确定能否分步滴定;再看cspiKi是否大于或等于10-9,以确定现有条件下能否直接准确滴定.The essence,significance and relationship of Polybasic Acid or Polybasic Base titration conditions were revealed with the titration curve.The findings showed that：Ki/Ki＋1is the determining factor of stepwise titration and the primary indicator that influences the titration jump;while cspiKiis the key which determines the jump value when Ki/Ki＋1is enough large.The decision procedure of before-titration is：first,to determine whether the Ki/Ki＋1of the measured object is greater than or equal to 10^5,so as to see whether the stepwise titration is applicable;then it is to determine whether cspiKiis greater than or equal to 10^-9,so as to see whether accurate titration can be directly applied under the current conditions.

关 键 词：多元酸碱 滴定条件 本质 意义 关系 

分 类 号：O655.22[理学—分析化学]