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关于溶解与结晶的计算,初中阶段要求简单,高中教材又未涉及,而高考中出现的试题要求高,因此在高三复习时必须对这方面内容补充与提高,加强这类题型的分析指导,提高学生分析问题解决问题能力。我们在高三复习时对溶解与结晶的计算题型作如下分类解析,请读者指教。 一、溶解度、溶质质量、溶剂质量和温度的推算。 1、溶解度的计算 例1.Mg(OH)_2难溶于水,但溶解的那部份完全电离,t°c时,Mg(OH)_2饱和溶液的pH值为11,若不考虑K_w变化,该温度下Mg(OH)_2的溶解度约为____。
Regarding the calculation of dissolution and crystallization, the requirements of the junior high school are simple, and the high school textbooks are not involved. However, the examination questions appearing in the college entrance examination require high standards. Therefore, during the third grade review, it is necessary to supplement and improve the content of this aspect, and to strengthen the analysis and guidance of such questions. Improve students’ ability to analyze problems and solve problems. During the third year of our review, we made the following classification analysis of dissolved and crystal calculated questions, please enlighten readers. First, the solubility, solute quality, solvent quality and temperature projections. 1. Solubility Calculation Example 1. Mg(OH) 2 is hardly soluble in water, but the dissolved portion is completely ionized. At t°c, the pH of the saturated solution of Mg(OH) 2 is 11 if K_w is not considered. The solubility of Mg(OH)2 at this temperature is approximately ____.