电解质溶液中离子浓度大小的比较及离子浓度之间的关系式判断是高考的热点。在解决这类考题时要学会灵活运用四类守恒关系,即电荷守恒、物料守恒、定组成守恒和质子守恒,同时还要注意这四类守恒关系之间的四则混合计算,这样才能快速准确地解决有关离子浓度系的考题。一、理解四类守恒关系以0.1mol·L-1的Na2CO3溶液为例,溶 Electrolyte solution ion concentration in the size of the comparison and the relationship between ion concentration judgment is the hot college entrance examination. In solving these questions should learn to flexibly use four kinds of conservation, namely, conservation of charge, conservation of materials, the composition of conservation and conservation of protons, but also pay attention to these four types of conservation between four mixed calculations, so as to quickly and accurately Solve the problem of ion concentration system. First, understand the four types of conservation To 0.1mol · L-1 of Na2CO3 solution, for example, dissolved