Berthollet, Claude Louis, Comte (klōd lwē, kôNt bĕrtōlāˈ) [key], 1748–1822, French chemist. His contributions to chemistry include the analysis of ammonia and prussic acid and the discovery of the bleaching properties of chlorine. He collaborated with Antoine Lavoisier in his researches and in reforming chemical nomenclature and supported him in his theory of combustion. His greatest contribution was in his Essai de statique chimique (1803), in which he presented his speculations on chemical affinity and his discovery of the reversibility of reactions.
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