福建省普通高中毕业班质量检查理科综合能力测试连续几年都对弱酸或弱碱的电离平衡常数进行考查,但学生的得分一直不理想,通过对学生的分析得知:学生对稍复杂的电离平衡常数的计算题型不知从何人手。下面就对这类题型进行分析。[例1]取20mLNH_3(其水合物的电离常数为K)的溶液,用0.10mol·L~(-1)盐酸滴定。滴定过 Fujian Province ordinary senior high school graduates quality examination science comprehensive ability test for several years have weak acid or weak base ionization equilibrium constant to examine, but the student score has been unsatisfactory, through the analysis of students that: students to slightly complicated ionization Calculation of equilibrium constant questions I do not know from where staff. The following questions on this type of analysis. [Example 1] Take a solution of 20 mL of NH 3 whose hydrate has an ionization constant of K and titrate with 0.10 mol·L -1 hydrochloric acid. Titration over