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基于磷酸电位滴定实验常用切线法、一阶微商法及二阶微商内插法等进行实验数据处理并计算磷酸离解平衡常数的烦琐与不准确性,提出一种与实验数据有高度吻合性的多重改良Logistic模型,应用优化求解得最佳函数表达式,解此函数一阶导数极大值点并计算得磷酸滴定半中和点,结合离解平衡常数校正公式最终得出了磷酸的离解平衡常数的各级pKa值,与文献结果相一致.另外,减少部分实验数据后应用模型处理并计算pKa值,所得结论仍具有一致性,从而提高了实验效率。
Phosphate potentiometric titration experiments commonly used tangential method, first-order and second-order derivative of the micro-commercial method of interpolation and other experimental data processing and calculation of phosphoric acid dissociation equilibrium constant cumbersome and inaccuracies proposed a highly consistent with the experimental data Multiple modified Logistic model was applied to solve the optimal function expression. The maximal value of the first derivative of this function was calculated and the half-neutralization point of phosphoric acid titration was calculated. The dissociation equilibrium of phosphoric acid was finally obtained by the formula of dissociation equilibrium constant The pKa values at all levels of the constants are consistent with the results of the literature. In addition, after reducing some of the experimental data and applying the model processing and calculating the pKa values, the conclusions obtained are still consistent and the experimental efficiency is improved.