Ernst Gottfried Fischer

Ernst Gottfried Fischer (17 July 1754 – 27 January 1831) was a German chemist. He was born in Hoheneiche near Saalfeld. After studying theology and mathematics at the University of Halle, he was a teacher in Berlin before becoming Professor of Physics in 1810. He translated Claude Berthollet's publication Recherches sur les lois de l'affinitié in 1802. He proposed a system of equivalents based on sulfuric acid equal to 1000.

Stoichiometry contribution

Jeremias Benjamin Richter's work had little impact until 1802, when it was summarized by Fischer in terms of tables, such as the one below.

According to this table, it takes 615 parts by weight of magnesia to neutralize either 1000 parts by weight of sulfuric acid or 1405 parts by weight of nitric acid. In the early literature on the subject, these weights were referred to as combining weights.

Weights of acids and bases that are chemically equivalent Bases Acids Name Parts required to titrate Name Parts required to titrate Alumina (aluminium oxide) 525 Carbonic acid 577 Magnesia 615 Muriatic acid (hydrochloric acid) 712 Lime (calcium carbonate) 793 Phosphoric acid 979 Calcium hydroxide 793 Oxalic acid 755 Soda (sodium carbonate) 859 Sulfuric acid 1000 Potash (potassium carbonate) 1605 Aqua fortis (nitric acid) 1405 Barite (barium sulfate) 2222 Acetic acid 1480

Works