The concept of chemical equilibrium was developed after Berthollet(1803) found that some chemical reactions are reversible.
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About this time Berthollet discovered the salt and sulphuric acid process, and
published it so it became public knowledge.
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In late 1786, while in Paris, he witnessed an experiment by Berthollet in which he reacted hydrochloricacid with manganesedioxide to produce chlorine.
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Until now, the experiments of Priestley, Boyle and Berthollet have been reproduced in laboratories for the production of hydrogen nitride
and ammonium chloride.
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In late 1786, while in Paris, he witnessed an experiment by Berthollet in which he reacted hydrochloric acid with manganese dioxide to produce chlorine.