| 库仑滴定法标定硫代硫酸钠标准溶液 |
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| 引用本文： | 王征帆,杨艳丽.库仑滴定法标定硫代硫酸钠标准溶液[J].当代化工,2011,40(6):659-660. |
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| 作者姓名： | 王征帆 杨艳丽 |
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| 作者单位： | 1. 渭南师范学院化学化工系,陕西渭南,714000
2. 陕西国防工业职业技术学院热能化工系,陕西西安,710302 |
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| 基金项目： | 渭南师范学院科研项目，项目号:10YKZ050 |
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| 摘 要： | 利用恒电流库仑滴定法电生碘对Na2S2O3标准溶液浓度进行了测定;选择1.0 mol/L KI-1.0 mol/L H3PO4（1︰1）溶液混合液作为电解液,电解过程中产生的滴定剂I2与Na2S2O3发生氧化还原反应,滴定终点采用死停终点法控制;该方法测定Na2S2O3结果与常规滴定分析法相吻合,精密度达到0.1%;该方法具有快速,更准确的优点,在化工生产及分析检验工作可代替常规滴定分析用于Na2S2O3标准标准溶液浓度的测定。
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| 关 键 词： | 库仑滴定法 Na2S2O3 死停终点法 |
Calibration of Na2S2O3 Standard Solution by Coulometric Titration |
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| WANG Zheng-fan,YANG Yan-li.Calibration of Na2S2O3 Standard Solution by Coulometric Titration[J].Contemporary Chemical Industry,2011,40(6):659-660. |
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| Authors: | WANG Zheng-fan YANG Yan-li |
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| Affiliation: | 1.Department of Chemistry and Chemical Engineering,Weinan Teachers College,Shaanxi Weinan 714000,China; 2.Department of Heat Energy and Chemical Engineering,Shaanxi Institute of Technology,Shaanxi Xi’an 710302,China) |
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| Abstract: | Concentration of Na2S2O3 standard solution was determined by coulometric titration.During determination,mixed liquid of 1 mol/L KI and 1 mol/L H3PO4（1︰1） was used as the electrolyte,I2 from electrolysis process reacted with Na2S2O3,the titration end-point was controlled by dead-stop method.The results show that the determination data with above method is consistent with result of common titration analysis,precision of the method can reach to 0.1%.This method is rapid and accurate,and it can be used to detect Na2S2O3 standard solution concentration instead of the common titration analysis. |
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| Keywords: | Coulometric titration Na2S2O3 Dead-stop method |
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