用EDTA滴定法测定溶液中的硫酸根浓度问题

Insm_188a0345

2021/08/26

私聊

水质检测

配置已知纯溶液硫酸钠90g/L。 EDTA是0.02mol/L 钡镁混合液是3g二水氯化钡和0.6g六水氯化镁溶于水并定容1L 铬黑T指示剂缓冲溶液PH10

计算公式硫酸钠（g/L）=(V空-v1)*0.02*142.04/v样

空白滴定结果是14.9ml

取样0.5ml纯溶液硫酸钠，消耗 EDTA3.0ml 结果是67.6g/L

取样0.2ml纯溶液硫酸钠，消耗 EDTA8.5ml 结果是90.9g/L

取样0.3ml纯溶液硫酸钠，消耗 EDTA5.5ml 结果是89.0g/L

根据公式反推取样0.5ml纯溶液硫酸钠，在消耗EDTA0.00001ml也可以当没有时。得到的结果是84g/L。但是滴加一滴EDTA时，溶液没有变色，滴定消耗EDTA3ml时，溶液从酒红色变成蓝色。这是为什么。

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