Karl Friedrich Mohr

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Karl Friedrich Mohr, lithograph by Rudolf Hoffmann , 1856
Karl Friedrich Mohr

Karl Friedrich Mohr , also Carl Friedrich Mohr , called Friedrich Mohr, (born November 4, 1806 in Koblenz , † September 28, 1879 in Bonn ) was a German scientist, pharmacist and chemist who made a special contribution in the field of dimensional analysis .

Life and work

Mohr first studied botany , chemistry and mineralogy for three semesters at the Friedrich-Wilhelms-Universität Bonn . He then completed an apprenticeship as a pharmacist in his father's company. 1828 enrolled himself as a student of pharmacy at the Ruprecht-Karls-University of Heidelberg , where he mainly lectures by Leopold Gmelin heard. In 1831 he moved to Berlin to study with Heinrich Rose , but soon went back to Heidelberg because of the rampant cholera there , where he became a Dr. phil. received his doctorate . He then returned to the “Mohren Pharmacy”, which he took over in 1841 after his father's death.

During this time he was active in many areas of the political and economic life of Koblenz. In 1835 he was a co-founder of the trade association and also its first chairman. Among other things, he was a member of the city council and was elected to the Prussian House of Representatives in 1849 . In 1852 the Lord Mayor of Koblenz appointed him to a commission to set up a trade school, which opened in the Krämerzunfthaus in 1855 and from which today's Eichendorff-Gymnasium emerged . After the pharmacy was sold, he joined his son-in-law's “Friedrich Nienhaus & Comp.” Chemical factory in 1857 as a partner . In the same year he moved to a newly acquired estate in Metternich . When the factory was liquidated (1864) he lost large parts of his fortune. In the same year he completed his habilitation in Berlin and then again in Bonn, where he gave his inaugural speech free. He was first a lecturer, then from 1867 associate professor for pharmacy at the Friedrich-Wilhelms-Universität Bonn. In 1879 Mohr died of pneumonia and he was buried in the old cemetery in Bonn. In 1914 a memorial was erected to him on the Kaiser-Wilhelm-Ring (today Friedrich-Ebert-Ring), the preserved bust of which stands today on a new base in front of the entrance to the Eichendorff High School in Koblenz.

Bust of Karl Friedrich Mohr in front of the Eichendorff-Gymnasium in Koblenz

The Mohr titration method goes back to Mohr, see Mohr titration . He also developed some laboratory equipment such as As the Quetschhahnbürette and the Westphal balance and invented the cork borer and the pipette. The particularly oxidation-resistant ammonium iron (II) sulfate (Mohr's salt) was named after Mohr.


  • Views on the nature of heat. Ann. der Pharm., 24, pp. 141-147; 1837.
  • Commentary on the Prussian Pharmacopoeia with translation of the text: edited from the 6th edition of the Pharmacopoea Borussica; for pharmacists, doctors and medicinal officials . - Braunschweig: Vieweg, 1848. 2 volumes (1) - (2) - Digitized edition of the University and State Library Düsseldorf .
  • Commentary on the Prussian Pharmacopoeia with translation of the text: based on the sixth edition of the Pharmacopoea Borussica; for pharmacists, doctors and medicinal officials . 2. presumably u. verb. Edition in two volumes. Vieweg, Braunschweig 1854 ( digitized edition of the University and State Library Düsseldorf ).
  • Textbook of the chemical-analytical titration method . 1855, numerous other editions.
  • Textbook of the chemical-analytical titration method: for chemists, doctors, etc. Pharmaceutical engineers, miners and smelters, manufacturers, agronomists, metallurgists, mint officials, etc.; based on our own experiments and presented systematically . Vieweg, Braunschweig 3rd edition. 1870. Digitized edition of the University and State Library Düsseldorf
  • Commentary and explanatory dictionary of words for all pharmacopoeias (Austriaca, Bavarica, Borussica, Saxonica etc.): an indispensable help book for doctors and pharmacists, as well as for students of medicine and pharmacy for the correct understanding of each national pharmacopoeia . Polet, Leipzig 2nd edition. 1859 Digitized edition of the University and State Library Düsseldorf
  • Textbook of pharmaceutical technology: based on personal experience; for pharmacists, chemists, chemical manufacturers and medicinal officials. Vieweg, 3rd edition Braunschweig 1866 Digitized edition of the University and State Library Düsseldorf
  • History of the earth, a geology on a new basis . 1866.
  • Chemical Toxicology: Instructions for the chemical identification of poisons . (Reprint of the Braunschweig, Vieweg, 1874 edition), Saarbrücken: VDM, Müller, 2006. ISBN 3-86550-923-1 .



  • Albert Ladenburg:  Mohr, Friedrich . In: Allgemeine Deutsche Biographie (ADB). Volume 22, Duncker & Humblot, Leipzig 1885, pp. 67-69.
  • Georg WA Kahlbaum (ed.): Justus von Liebig and Friedrich Mohr in their letters from 1834–1870. A picture of time . Leipzig 1904.
  • Daniel Eisenmenger: Friedrich Mohr - pharmacist and politician, scientist and school founder . In: Yearbook Eichendorff-Gymnasium Koblenz 2010/2011, pp. 200–206.
  • Hansjörg Schütz: Karl Friedrich Mohr - a world-renowned scientist . In: Hartmut Froesch, Karl H. Kirch, Hansjörg Schütz: Eichendorff-Gymnasium Koblenz 1855-2005. A commemorative publication for the 150th anniversary of the founding of a Koblenz school . Bad Honnef 2005, pp. 169-171.
  • Schwarz, Holm-Dietmar:  Mohr, Friedrich. In: New German Biography (NDB). Volume 17, Duncker & Humblot, Berlin 1994, ISBN 3-428-00198-2 , pp. 708 f. ( Digitized version ).
  • Wolfgang Schütz: Koblenz heads. People from the city's history - namesake for streets and squares. Verlag für Werbung Blätter GmbH, ed .: Bernd Weber, Mülheim-Kärlich 2005 (2nd revised and expanded edition), p. 392 f.
  • John M. Scott: Karl Friedrich Mohr. 1806-1879. Father of volumetric analysis . In: Chymia 3 (1950), pp. 191-203.

Web links

Commons : Karl Friedrich Mohr  - Collection of images, videos and audio files

Individual evidence

  1. a b Information page of the city of Koblenz .
  2. a b Chr. Friedrich, Pharmazeutische Zeitung 151 , 60-62 (2006).
  3. Ruth Lotze, The Influence of Carl Friedrich Mohr on the Development of Measure Analysis , Dissertation, Frankfurt a. M., 1968.
  4. Gerhard Schulze / Günther Jander / Jürgen Simon: Measure analysis: Theory and practice of titrations with chemical and physical indications , 17th edition, Berlin, 2009, p. 312. Digitized edition .