混合碱滴定分析

Titration Analysis of Mixed Base

混合碱是碳酸钠与碳酸氢钠或碳酸钠与氢氧化钠的混合物.测定混合碱的方法主要采用双指示剂法。通过对传统的双指示剂进行比较,发现测定时使用甲酚红-百里酚蓝+甲基橙双指示剂进行滴定,再通过消耗的盐酸的体积计算混合碱中的组分与含量,结果较为准确。整个操作简洁实用,可用于含有色杂质的混合碱滴定分析,有较大推广价值。

Mixed base is a kind of mixture which is component of alkali sodium carbonate and sodium bicarbonate, or of sodium carbonate and sodium hydroxide. Determination of mixed alkali contents mainly applies double indicator method. By comparison with the traditional method, it is found that the result will be much better if new double indicator of cresol red-Thymol blue and methyl orange double indicators are used, and color obvious change at solution stoichiometric point is used to judge its end point of titration. The entire operation is practical and simple, the determination result is accurate.