《测定硝酸钾在水中的溶解度》是中学阶段第一个较复杂的定量实验。在这以前的学生实验都是定性的,主要是通过观察现象认识物质的性质和变化,而定量实验则要求测出较准确的数据,难度要大一些。在《测定硝酸钾在水里的溶解度》实验中,按教材所述实验步骤进行操作,结果误差较大,主要存在两方面问题:一是温 “Measurement of Potassium Nitrate Solubility in Water” is the first more complex quantitative experiment in middle school. In the past, student experiments were qualitative, mainly by observing the phenomenon to understand the nature and changes of the material, while quantitative experiments required more accurate data to be measured, which was more difficult. In the “Measurement of Potassium Nitrate Solubility in Water” experiment, according to the experimental procedures described in the textbook, the results are relatively large, and there are two main problems: First, the temperature