对硫酸性质的认识,似乎是尽人皆知。事实并非如此,仍有待于人们作深入探讨之处。曾有人作过将金属钠置于浓硫酸中放出氢气的实验,由于种种原因,这一事实,未曾引起人们的重视,甚至,对此实验持怀疑、否定态度的大有人在。笔者为了弄清事实真象,设计了实验方案,改进了实验方法,变更硫酸的浓度(浓硫酸、纯硫酸和发烟硫酸),经多次实验证实,将金属钠置于冷浓硫酸中,确实产生的是氢气。这一事实,引起了我们的关注,因为按传统的观点,只有“稀硫酸与电位序在氢以前的金属如镁、锌、铁等作用而放出氢气”, The understanding of the nature of sulfuric acid, seems to be well known. This is not the case, and it remains to be explored in depth. There have been experiments in which metallic sodium was released into concentrated sulfuric acid to emit hydrogen gas. Due to various reasons, this fact has not drawn people’s attention. Even the people who are skeptical of this experiment and who have a negative attitude are present. In order to clarify the truth, the author designed the experimental plan, improved the experimental method, changed the concentration of sulfuric acid (concentrated sulfuric acid, pure sulfuric acid and fuming sulfuric acid). After many experiments, it was confirmed that sodium metal was placed in cold concentrated sulfuric acid Produced is hydrogen. This fact has drawn our attention because, according to the traditional view, only “the dilute sulfuric acid emits hydrogen when interacting with metals of the pre-hydrogen potential such as magnesium, zinc, iron, etc.”