在学习的许多化学反应中,有相当部分化学反应是在溶液中进行的,以及接触到的一些试剂,如稀硫酸、盐酸等,它们本身就是溶液,在基本操作训练时,也常碰到有关溶液的问题,如食盐的提纯等等.因此,我们有必要系统地学习“溶液”,有助于学习好化学知识,有助于理解与认识的提高. Among the many chemical reactions studied, a considerable part of the chemical reactions are carried out in solution, and some reagents that come into contact with them, such as dilute sulfuric acid, hydrochloric acid, etc., are themselves solutions, and they are often encountered during basic operation training. Solution problems, such as the purification of salt, etc. Therefore, we need to systematically study “solutions”, help to learn good chemistry knowledge, help understanding and understanding.