摘要
水是极弱的电解质,能微弱电离出少量的H^(+)和OH^(-),其电离过程会受到温度、酸、碱、盐和部分金属等外界条件的影响。水的电离过程变化不明显,属于微观层次,不便于学生观察。实验借助手持技术将水电离过程可视化,依据实验所得图表和K_(w)=c(H^(+))_(H_(2)O)·c(OH-)_(H_(2)O)、c(H^(+))_(H_(2)O)=c(OH-)_(H_(2)O)关系计算水电离出的H^(+)或OH^(-)浓度。强酸、强碱抑制水的电离;而强酸弱碱盐、强碱弱酸盐和弱酸弱碱盐促进水的电离,且后者的促进程度强于前两者。
Water is a very weak electrolyte,which can weakly ionize a small amount of H+and OH-,and the ionization process will be affected by external conditions such as temperature,acid,alkali,salt and some metals.The content of“influencing factors of water ionization”is not presented in the textbook.Teachers mainly guide students to understand this content through teaching reference materials.Students mainly study through memory practice,which is not conducive to their real understanding and the development of core literacy of chemistry.In addition,the ionization process of water does not change obviously,which belongs to the micro level,which is not convenient for students to observe.Therefore,the experiment visualizes it with the help of handheld technology,according to the experimental chart and k W=c(H+)H 2O·c(OH-)H 2O;c(H+)H 2O=c(OH-)H 2O relationship,calculate the H+or OH-concentration ionized by water,and then strong acid and strong alkali inhibit the ionization of water;Strong acid weak alkali salt,strong alkali weak acid salt and weak acid weak alkali salt promote the ionization of water,and the latter is stronger than the first two.
作者
赵瑞
陈娅娟
李睿
Zhao Rui;Chen Yajuan;Li Rui(School of chemistry and chemical engineering,Yunnan Normal University,Kunming 650000,China)
出处
《云南化工》
CAS
2022年第5期64-66,共3页
Yunnan Chemical Technology
关键词
数字化实验
水的电离
外界条件
手持技术
digital experiment
ionization of water
external conditions
handheld technology
