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(14分) 研究小组用下图装置制取Cl 2 ,证明产生的气体中含有HCl。 (1)仪器A的名称为 ;A中反应的离子方程式为 。 (2)甲同学将A中产生的气体通入下列溶液: 实验序号 试剂 现象 a 紫色石蕊溶液 b AgNO 3 溶液 出现白色沉淀 ①实验a中的现象为 。 ②不能证明产生的气体中含有HCl的实验是 (填字母序号)。 (3)已知将HCl气体通入饱和食盐水中有白色固体析出。将A中产生的气体通入饱和食盐水中,有白色固体析出,但该实验不能证明气体中含有HCl,结合化学用语解释其原因: 。 (4)已知:2S 2 O 3 2- + I 2 ='==' S 4 O 6 2- + 2I - 。丙同学将A中产生的气体通入蒸馏水中,得到溶液X,进行以下实验证明气体中含有HCl。 I.测定X中溶解的Cl 2 。取25.00 mL溶液X,加入过量KI溶液,然后用0.04 mol?L -1 Na 2 S 2 O 3 溶液滴定生成的I 2 ,达滴定终点时消耗Na 2 S 2 O 3 溶液V mL。 II.测定X中Cl元素总量。另取25.00 mL溶液X,选用适当的还原剂将溶解的Cl 2 全部还Cl - ,再用0.10 mol?L -1 AgNO 3 溶液滴定所得溶液中的Cl - 。 X中的HClO不会影响I的测定结果,原因是 。 由I、II 中实验数据可证明A中产生的气体中含有HCl,则II中消耗0.10 mol?L -1 AgNO 3 溶液的体积应大于 mL(用含V的代数式表示)。
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