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接触法生产H_2SO_4和固体SO_3的制备,是现行统编高一教材的一个课堂演示实验。笔者进行了大量的探讨性的实验,取得了较明显的效果,现将实验的点滴体会介绍如下。一、反应气体的制备和纯度以及储存办法。1.SO_2的制备方法:用Na_2SO_3或者用NaHSO_3与浓硫酸作用的方法制备SO_2,只是成本高一点,但装置简单,纯度较高。
The preparation of H_2SO_4 and solid SO_3 by the contact method is a classroom demonstration experiment for the current Unified High School textbook. The author carried out a large number of exploratory experiments and achieved more obvious results. Now I introduce the experience of the experiment as follows. First, the preparation and purity of the reaction gas and storage methods. 1. Preparation method of SO2: Preparation of SO 2 with Na 2 SO 3 or NaHSO 3 with concentrated sulfuric acid is only a little higher cost, but the device is simple and the purity is high.