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一、电荷守恒(98年高考化学11题,简写为’98MCE11,以下同).等体积等浓度的MOH强碱溶液和HA弱酸溶液混合后,混合液中有关离子的浓度应满足的关系是( )解析:从题给条件,MOH与HA恰好完全中和生成强碱弱酸盐MA和H_2O,所以溶液中的阳离子有M~+和H~+,阴离子有A~-和OH~-。根据电解质溶液中阴阳离子所带电荷的代数和为零的规则,选项(D)正确。又由于MA为强碱弱酸盐,所以弱酸根A~-离子水解,故选项(C)也正确。当然选项(A)、(B)就是错误的了。
First, the conservation of charge (98 college entrance examination chemistry 11 questions, abbreviated as ’98MCE11, the same below). Equal volume and concentration of MOH strong alkali solution mixed with HA weak acid solution, the concentration of the relevant ions in the mixture should meet the relationship ( Analyze: From the title of the conditions, MOH and HA are exactly neutralized to generate the strong base weak acid salts MA and H2O, so the cations in solution have M~+ and H~+, and the anions have A~~ and OH~-. The option (D) is correct based on the algebraic and zero rule of the charge carried by the anions and cations in the electrolyte solution. Also because MA is a strong base weak acid salt, the weak acid radical A~- ions are hydrolyzed, so option (C) is also correct. Of course options (A) and (B) are wrong.