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1.熟练掌握两个规律比较离子或溶质浓度大小,考查的内容通常既与盐的水解有关,又与弱电解质的电离平衡有关,而这两个平衡变化的共同特征为反应是“微弱”的.(1)弱电解质只有微弱电离,如稀醋酸溶液中,各粒子浓度由大到小的顺序为c(CH_3COOH)>c(H~+)>c(CH_3COO-)>c(OH-).多元弱酸分步电离,以第一步为主,如H_2S溶液中各粒子浓度由大到小的顺序为
1. Familiar with the two laws of ions or solute concentration compared to the content of the test is usually both salt hydrolysis and weak electrolytes ionization balance related to the balance of these two changes in the common characteristics of the reaction is (1) weak electrolyte only weak ionization, such as dilute acetic acid solution, the particle concentration descending order of c (CH_3COOH)> c (H ~ +)> c (CH_3COO -)> c ) .Multiple weak acid step by step ionization, with the first step, such as H 2 S solution in each particle concentration descending order