Scheler was the first discoverer of chlorine, but he did not regard chlorine as a simple substance. After Scheler, Bertholle found that the aqueous solution in which chlorine was dissolved was decomposed into hydrochloric acid and oxygen where there was light, so he arbitrarily concluded that chlorine was generated by the combination of hydrochloric acid and oxidation, but in fact he ignored the role of water.
1809, cover? Lussac and Tanner proved the composition of hydrochloric acid by synthesis. They mixed the same amount of hydrogen and chlorine and let it stand for a few days to produce hydrochloric acid gas. Unfortunately, when French chemist lavoisier put forward the combustion theory, he also put forward the argument that "oxygen is an acid-forming element". Guy? Lussac and Turner are convinced of this view. They also believe that chlorine is some kind of "free radical" oxide.
18 10, David began to do chlorine decomposition experiments. When burning charcoal with a dry battery to white heat, he began to suspect that chlorine contained oxygen. He repeated the experiment of synthesizing hydrochloric acid with oxygen and oxygen. He found that after hydrochloric acid was produced, there were no other impurities except a little water. No oxygen was found in chlorine or hydrochloric acid. David believes that all experiments about chlorine can only be reasonably explained if chlorine is regarded as an element. In June165438+1October this year, David read his paper at the Royal Society and formally proposed that chlorine is an element.
Later, the new facts of chemical development fully proved the correctness of David's conclusion. Lavoisier's argument that all acids contain oxygen has also been corrected.