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十字交叉法在化学计算中具有实用性强、能准确迅速求解的特点.但不少学生对其原理及适用范围不清楚,常出现不应有的错误,因而不敢大胆使用实在可惜.现从原理介绍入手,希望能对学生清除障碍合理使用此法有所帮助.1.十字交叉法的原理十字交叉法最初应用于一定质量分数溶液的混合计算上.如用80%和40%的H2SO4溶液相混合配制成50%的H2SO4溶液,求两种质量分数H2SO4溶液的质量比.列十字交叉式:
Cross-cross method has strong practicability in chemical calculation, can be accurately and quickly solve the characteristics.But many students on its principles and scope of application is not clear, often unworthy of error, and therefore not bold to use is a pity. Principle introduction to start, hoping to remove obstacles for students to use this method is reasonable 1. The principle of cross method Cross method was originally used to calculate the mixed solution of a certain mass fraction, such as using 80% and 40% H2SO4 solution Mixed to prepare a 50% solution of H2SO4, find the quality ratio of two mass fraction H2SO4 solution Column Cross: