中和热的测定实验是中学化学中重要的演示实验之一。教材演示实验存在以下不足:实验结果误差大;温度变化度数可能在橡皮塞内而无法读数;装置保温效果不好;操作较繁琐。因此,笔者对该实验进行改进,使实验操作简便,效果良好,以适合教师演 Determining neutralization heat is one of the most important demonstration experiments in chemistry in middle schools. Teaching material demonstration experiment has the following deficiencies: the experimental results of error; temperature degree of variation may not be able to read inside the rubber stopper; device insulation effect is not good; the operation is more cumbersome. Therefore, the author of the experiment to improve, so that experimental operation is simple, effective, to suit the teacher