摘要
根据电化学平衡原理对氧化还原滴定的过程进行了讨论,建立了溶液的电极电势值与滴定分数的数学模型,并推导了氧化还原滴定终点误差的计算公式。利用VisualBasic强大的绘图和计算功能,设计了一个程序用以求解氧化还原滴定的化学计量点、突越范围,绘出滴定曲线,该程序也可根据提供的指示剂的变色点计算出滴定误差。最后用某一实例对计算程序进行了验证,运算结果和参考数据吻合良好。程序可用于指导氧化还原滴定指示剂的选择以便提高分析的精确度。
A mathematical model on the potential electrode value of the solution vs. the titration percentage was established by the theory of the chemical equilibrium, therefore; the calculating formula of the end point error in the redox titration was deduced. By the strong function of the Visual Basic language in the calculation and plotting, a program was designed to calculate the stoichiometric point and the jump range of the titration, moreover; the program can draw the titration curve and calculate the end point error of the titration according to the color-shift point. Finally; the example was taken to verify the program and it shows the calculation results agree well with the documents data. The program can conduce to choose the appropriate indicator so that the accuracy of the analysis can be improved.
出处
《南阳理工学院学报》
2011年第2期104-108,共5页
Journal of Nanyang Institute of Technology
基金
河南省科技厅项目(0524270015)
关键词
氧化还原滴定
计算机模拟
弦割法
滴定突跃
滴定曲线
终点误差
redox titration
computer simulation
chord secant method
titration jump
titration curve
end point error
