对莫尔法测定盐中氯离子的一点看法  

Some Views on Determination of Chloride Ion in Salt by Mohr Method

作　　者：刘文春 Liu Wenchun(Guangdong Zhanhua Group CO.,LTD.,Guangdong,524001)

机构地区：[1]广东湛化集团有限公司,广东524001

出　　处：《当代化工研究》2019年第1期31-32,共2页Modern Chemical Research

摘　　要：莫尔法是在中性或弱碱性溶液中,以K2CrO4为指示剂,用AgNO3标准溶液进行滴定,滴定至砖红色为终点,同时做试剂空白。传统文献规定终点是砖红色,而在实际操作过程中,在氯化银存在背景下,橙色和砖红色不易分辨,笔者通过实验,确定试样和空白都滴至橙色即可,便于化验人员确定终点。Mohr method refers to titration with AgNO3 standard solution in neutral or weak alkaline solution with K2CrO4 as indicator,titration to brick red as the end point,and reagent blank at the same time.According to the traditional literature,the end point is brick red,but in the actual operation process,orange and brick red are not easy to distinguish in the presence of silver chloride.Through experiments,the author determined that both the sample and the blank drop to orange,which is convenient for laboratory technicians to determine the end point.

关 键 词：莫尔法 滴定 终点 

分 类 号：O[理学]