Punktierstich Ernst Gottfried Fischer (1754-1831)

Ernst Gottfried Fischer (17 July 1754 – 27 January 1831) was a

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...

. He was born in Hoheneiche near

Saalfeld Saalfeld (german: Saalfeld/Saale) is a town in Germany, capital of the Saalfeld-Rudolstadt district of Thuringia. It is best known internationally as the ancestral seat of the House of Saxe-Coburg and Gotha, Saxe-Coburg and Gotha branch of the S ...

. After studying

theology Theology is the systematic study of the nature of the divine and, more broadly, of religious belief. It is taught as an academic discipline, typically in universities and seminaries. It occupies itself with the unique content of analyzing the ...

and

mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics ...

at the

University of Halle Martin Luther University of Halle-Wittenberg (german: Martin-Luther-Universität Halle-Wittenberg), also referred to as MLU, is a public, research-oriented university in the cities of Halle and Wittenberg and the largest and oldest university i ...

, he was a teacher in

Berlin Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...

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 Sulfuric acid (American spelling and the preferred IUPAC name) or sulphuric acid ( Commonwealth spelling), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with the molecular formu ...

equal to one hundred.

Stoichiometry contribution

Jeremias Benjamin Richter Jeremias Benjamin Richter (; 10 March 1762 – 4 May 1807) was a German chemist. He was born at Hirschberg in Silesia, became a mining official at Breslau in 1794, and in 1800 was appointed assessor to the department of mines and chemist to the ...

'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

or 1405 parts by weight of

nitric acid Nitric acid is the inorganic compound with the formula . It is a highly corrosive mineral acid. The compound is colorless, but older samples tend to be yellow cast due to decomposition into oxides of nitrogen. Most commercially available nitri ...

. In the early literature on the subject, these weights were referred to as combining weights.

Works

References

* * 1754 births 1831 deaths 19th-century German chemists 18th-century German chemists {{Germany-chemist-stub