盐酸滴定碱的线性方程简化式及其应用

A Linear Simplification Equation for Titration of Alkali with Hydrochloric Acid and Its Application

导出了盐酸滴定碱的线性方程简化式,应用于测定稀的极弱碱、多元碱、强弱碱混合液及抗酸药碳酸氢钠片的含量,不需要极弱碱的稳定常数Ks,即可简便快速计算V-pH数据,作直线确定反应终点,其结果的RSD和RE(绝对值)分别为0.16%～0.66%和0.090%～0.91%。

A linear simplification equation for titration of alkali with hydrochloric acid is presented and applied to determine dilution solution of very weak alkali ,a mixture of the strong and very weak base, polyprotic alkali,and medicinal sodium bicarbonate .The pH-acid volume data can be quickly calculated by the linear simplification equation without using the stability constant of the very weak alkali ,and the reaction end point can be obtained through linear graph-plotting. The relative standard deviation and the relative error (absolute value) of the results is 0.16% ～0.66% and 0.090% ～0.91% respectively which meets the requirement of general chemical analysis.