简便快速计算线性作图法测定稀的极弱碱

A Linear Graphic Method with Fast Calculation to Determine Dilute Weak Alkali Solution

提出了HCl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,其结果的相对标准偏差和绝对误差分别为0.16%～0.66%和0.090%～0.91%。

A linear simplified equation for titration of alkali with hydrochloric acid is presented and applied to determine dilution solution of very weak alkali, mixture of strong and very weak base, polyprotic alkali , and medicinal sodium bicarbonate .The pH-acid volume data can be quickly calculated by the linear simplified 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.