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2. 电位滴定法测定氯离子浓度及 AgCl 的 Ksp

2. 电位滴定法测定氯离子浓度及 AgCl 的 Ksp. —— 电化学分析法. 一、实验目的. 1. 掌握电位滴定法测量离子浓度的一般原理; 2. 学会用电位滴定法测定难溶盐的溶度积常数。. 二、实验原理. 1. 原电池:. 甘汞电极(参比电极)ㄧ待测溶液ㄧ银电极(指示电极). 银电极电极电势:. 原电池电动势:. 2. 卤化银沉淀溶解平衡. 沉淀溶解平衡时: [Ag + ]·[X - ] =Ksp ,. 银离子与卤离子完全反应时: [Ag + ]=[X - ]. 所以滴定终点时:. 此时:. 3. 终点确定方法(作图法):. 三、实验内容.

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2. 电位滴定法测定氯离子浓度及 AgCl 的 Ksp

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  1. 2.电位滴定法测定氯离子浓度及AgCl的Ksp ——电化学分析法

  2. 一、实验目的 • 1.掌握电位滴定法测量离子浓度的一般原理; • 2.学会用电位滴定法测定难溶盐的溶度积常数。

  3. 二、实验原理 1.原电池: 甘汞电极(参比电极)ㄧ待测溶液ㄧ银电极(指示电极) 银电极电极电势: 原电池电动势: 2.卤化银沉淀溶解平衡 沉淀溶解平衡时:[Ag+]·[X-] =Ksp, 银离子与卤离子完全反应时:[Ag+]=[X-] 所以滴定终点时: 此时: 3.终点确定方法(作图法):

  4. 三、实验内容

  5. 四、数据记录与处理 (二)E~lg[Ag+]关系的确定 (一)水样测定 (三)结果计算(已知c(AgNO3)= mol/L 注: 应用内插法确定终点V (AgNO3)、终点电位E

  6. 五、思考题 • 1.与化学分析法中的容量法相比,电位滴定法有何特点? • 2. 如何计算滴定反应的理论电位值?

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