摘要
研究了双组分混合弱酸溶液〔Ｈ＋〕近似计算时忽略水离解的条件和平方加和法则的适用性。当较强酸的浓度（Ｃ１）满足Ｃ１≥ｂＫａ１（ｂ值范围０５～８，与Ｃ１／Ｃ２、Ｋａ１／Ｋａ２等值有关）时，使用平方加和法则计算〔Ｈ＋〕的误差较小（｜ＲＥ｜≤±２３％）。
In this article, both conditions of applying discriminant equation derived by us and square-additional rule (SAR) in approximate calculation of H for the solution of mixtures of two weak monoprotic acids have been studied For the selection of the approximation formula a simple method, using the values of analytical concentration (C) of one of two acids mixed and its dissociation constant (K a),is also presented When K a1 > K a2 ,for acids having C 1≥bK a1 (the value of varies with magnitude of the parameters related to the system,i e , C 2/C 1,K a1 / K a2 and C 1K a1 / C 2K a2 ,and ranges 0 5 to 8 0),the relative errors of approximate values of H + calculated by using SAR are ≤±2 3%
出处
《江苏石油化工学院学报》
1997年第4期31-35,共5页
Journal of Jiangsu Institute of Petrochemical Technology
关键词
混合弱酸
氢离子浓度
近似计算
滴定分析
弱酸
Two monoprotic weak acids
Hydrogen ion concertration
Approximate calculation
