试题与答案

某课外活动小组用如图1装置进行实验,试回答下列问题. (1)若开始时开关K与a连

题型:问答题

题目:

某课外活动小组用如图1装置进行实验,试回答下列问题.

(1)若开始时开关K与a连接,则B极的电极反应式为______.

(2)若开始时开关K与b连接,则B极的电极反应式为______,总反应的离子方程式为______.有关上述实验,下列说法正确的是(填序号)______.

①溶液中Na+向A极移动

②从A极处逸出的气体能使湿润的KI淀粉试纸变蓝

③反应一段时间后加适量盐酸可恢复到电解前电解质的浓度

④若标准状况下B极产生2.24L气体,则溶液中转移0.2mol电子

(3)该小组同学认为,如果模拟工业上离子交换膜法制烧碱的方法,那么可以设想用如图2装置电解硫酸钾溶液来制取氢气、氧气、硫酸和氢氧化钾.

①该电解槽的阳极反应式为______.

此时通过阴离子交换膜的离子数______(填“大于”、“小于”或“等于”)通过阳离子交换膜的离子数.

②若将制得的氢气、氧气和氢氧化钾溶液组合为氢氧燃料电池,则电池正极的电极反应式为______.

答案:

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