怎样判断混合溶液中离子浓度大小

2025年04月07日 13:28
有1个网友回答
网友(1):

应是溶液显碱性,所以氨根大于氯离子,大于氢氧根,大于氢离子。你可以看看炭酸钠溶液的离子浓度,同样氢离子和炭酸氢根是无法比较的。
追问:
我反驳你的观点,碳酸钠中碳酸根水解得碳酸氢根和氢氧根为主要,而水解得到的碳酸氢根继续水解得碳酸和氢氧根离子,水本身电离出氢离子,和氢氧根离子,所以有c(Na+)>c(CO3
2-)>c(OH-)>c(HCO3-)>c(H+),而前一问关于氨水我还是不理解
追问:
我反驳你的观点,碳酸钠中碳酸根水解得碳酸氢根和氢氧根为主要,而水解得到的碳酸氢根继续水解得碳酸和氢氧根离子,水本身电离出氢离子,和氢氧根离子,所以有c(Na+)>c(CO3
2-)>c(OH-)>c(HCO3-)>c(H+),而前一问关于氨水我还是不理解,您可以作详细解释吗?
回答:
该溶液中,氢氧根由炭酸根水解为氢氧根和炭酸氢根,还有水自身电离的氢氧根、氢离子。现在讨论:炭酸氢根是水解产生炭酸、氢氧根;还是电离为炭酸根、氢离子?哪个进行的量多?你列出我说的所有式子,比较一下就知道了。

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