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中学化学实验中,常用到量筒、容量瓶、滴定管等定量实验仪器,使用这些仪器进行液体量取、配制一定物质的量浓度的溶液、酸碱中和滴定等相关实验中都要进行读数,读数不当会造成实验误差,分析读数误差及因读数误差导致的实验误差是学生的一个典型易错点,如何让学生从本质上理解读数与误差的关系呢?我们从原理和方法两个方面进行突破.一、单一“读数误差”1.不变的原理用量筒、容量瓶、滴定管这些与液体体积有关的定量仪器
High school chemistry experiments, commonly used to quantitative cylinder, volumetric flask, burette and other quantitative experimental equipment, the use of these instruments to measure the amount of liquid, the preparation of a certain concentration of the amount of substance solution, acid-base neutralization titration and other related experiments have to be read, Improper will cause experimental error, analysis of reading errors and experimental errors caused by reading errors is a typical error-prone students, how to make students understand the relationship between readings and errors? We make breakthroughs in both principle and method . A single “reading error ” 1. The same principle Cylinder, volumetric flask, burette These volume-related quantitative instruments