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沉淀滴定法自测题

1．写出莫尔法、佛尔哈德法和法扬斯法测定Cl- 的主要反应，并指出各种方法选用的指示剂和酸度条件。

2．以AgNO3滴定Cl-为例，简单说明沉淀滴定法中用法扬斯法确定计量点的原理（以荧光黄作指示剂）。

3．用银量法测定下列试样：（1）BaCl2，（2）KCl，（3）FeCl3，（4）KSCN，（5）NH4Cl，（6）NaCl +Na2SO4，（7）NaBr，各应选用何种方法确定终点较为合适？为什么？

4．称取纯的KIOx试样0.5000g，将碘还原成碘化物后，用0.1000 mol/L的AgNO3标准溶液滴定，用去23.36mL。计算分子式中的x。
 

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