| 强酸-弱酸混合体系中准确滴定强酸的研究 |
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| 引用本文： | 马荔,张卫,陈虹锦,梁竹梅,谢少艾,李梅.强酸-弱酸混合体系中准确滴定强酸的研究[J].实验室研究与探索,2011,30(2):5-8. |
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| 作者姓名： | 马荔 张卫 陈虹锦 梁竹梅 谢少艾 李梅 |
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| 作者单位： | 上海交通大学化学化工学院,上海,200240 |
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| 基金项目： | “十一五”国家科技支撑计划重点项目(2008BAH29B00) |
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| 摘 要： | 为准确滴定出强酸-弱酸混合体系中所含强酸的量,需考虑在不同的准确度要求条件下,混合酸体系中弱酸的浓度范围要求。基于混合酸滴定过程终点误差的2个来源分析,提出了混合酸体系中终点误差(TE)计算的新方法。在指定的终点误差要求和强酸的浓度范围条件下,计算了HCl-HAc、HCl-六次甲基四胺盐两种混合酸体系中HAc、六次甲基四胺盐浓度范围要求,随着各酸碱指示剂变色点pH值的增大,两弱酸浓度的上限要求逐渐减小。在|TE|=1%条件下,当HAc、六次甲基四胺盐浓度分别低于1.18和0.135 mmol/dm3时,可采用任意酸性指示剂准确滴定0.1 mol/dm3浓度范围的HCl含量;而当两弱酸浓度分别低于10.6和10.5 mmol/dm3时,准确滴定出混合酸体系中1.0 mol/dm3的HCl含量亦可采用任意酸性指示剂。
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| 关 键 词： | 强酸-弱酸混合体系 终点误差 滴定突跃 弱酸浓度范围 |
Research on Direct and Accurate Titration of Strong Acid Strong-Weak Acid Mixture |
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| MA Li,ZHANG Wei,CHEN Hong-jin,LIANG Zhu-mei,XIE Shao-ai,LI Mei.Research on Direct and Accurate Titration of Strong Acid Strong-Weak Acid Mixture[J].Laboratory Research and Exploration,2011,30(2):5-8. |
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| Authors: | MA Li ZHANG Wei CHEN Hong-jin LIANG Zhu-mei XIE Shao-ai LI Mei |
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| Institution: | MA Li,ZHANG Wei,CHEN Hong-jin,LIANG Zhu-mei,XIE Shao-ai,LI Mei (School of Chemistry and Chemical Engineering,Shanghai Jiaotong University,Shanghai 200240,China) |
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| Abstract: | In order to gain accurately the concentration of the strong acid in strong-weak acid mixture by acid-base titration,the concentration of the weak acid in the mixture need to be considered at different accuracy demand condition.Based on the analysis of the two sources of the end point error(TE)in the titration process,this article proposed a new method of calculating the end point error in the mixture by acid-base titration.It calculated the concentration range demands of acetate acid and hexamethylenetetram... |
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| Keywords: | strong-weak acid mixture end point error titration jump concentration range of weak acid |
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