下列实验事实不能用勒夏特列原理解释的是(  )A.实验室用排饱和食盐水的方法收集氯气B.打开汽水瓶时

2025-03-16 04:36:51
推荐回答(1个)
回答1:

A、氯化钠在溶液中完全电离,所以饱和食盐水中含有大量的氯离子,氯气溶于水的反应是一个可逆反应,Cl2+H2O?ClO-+2H++Cl-,由于饱和食盐水中含有大量的氯离子,相当于氯气溶于水的反应中增加了大量的生成物氯离子,根据勒夏特列原理,平衡向逆反应方向移动,氯气溶解量减小,可以勒夏特列原理解释,故A不选;
B、汽水瓶中存在平衡H2CO3?H2O+CO2,打开汽水瓶时,压强降低,平衡向生成二氧化碳方向移动,可以用勒夏特列原理解释,故B不选;
C、二氧化氮转化为四氧化二氮是放热反应,所以温度改变平衡移动,可以用勒夏特列原理解释,故C不选;
D、使用催化剂只改变反应速率,但平衡不移动,不可以用勒夏特列原理解释,故D选;
故选D.

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