Karlsruhe Congress

The Karlsruhe Congress was an international meeting of chemists held in Karlsruhe, Germany from September 3, 1860 to September 5, 1860.

The meeting

The Karlsruhe Congress was called so that European chemists could discuss matters of chemical nomenclature, notation, and atomic weights. The organization, invitation, and sponsorship of the conference were handled by Kekulé, Wurtz, and Karl Weltzien. [cite book | last = Leicester | first = Henry M. | title = The Historical Background of Chemistry | publisher = John Wiley and Sons | year = 1956 | pages = 191 – 192 ] As an example of the problems facing the delegates, Kekulé's "Lehrbuch der Organischen Chemie" gave nineteen different formulas used by chemists for acetic acid, as shown in the figure on this page. [cite book | last = Kekulé | first = A. | title = Lehrbuch der Organischen Chemie | publisher = Verlag von Ferdinand Enke | year = 1861 | page = 58 ]

The Karlsruhe meeting ended with no firm agreement on the vexing problem of atomic and molecular weights. However, on the meeting's last day reprints of Cannizzaro's 1858 paper on atomic weights, in which he utilized earlier work by Avogadro, were distributed. Cannizzaro's efforts exerted a heavy and, in some cases, an almost immediate influence on the delegates. Lothar Meyer later wrote that on reading Cannizzaro's paper, "The scales seemed to fall from my eyes." [cite book | last = Moore | first = F. J. | title = A History of Chemistry | publisher = McGraw-Hill | year = 1931 | pages = 182 – 1184 (2nd edition)]

An important long-term result of the Karlsruhe Congress was the adoption of the now-familiar atomic weights (actually, atomic masses). Prior to the Karlsruhe meeting, and going back to Dalton's work in 1803, several systems of atomic weights were in use. In one case, a value of 1 was adopted as the weight of hydrogen (the base unit), with 6 for carbon and 8 for oxygen. As long as there were uncertainties over atomic weights then the compositions of many compounds remained in doubt. Following the Karlsruhe meeting, values of about 1 for hydrogen, 12 for carbon, 16 for oxygen, and so forth were adopted. This was based on a recognition that certain elements, such as hydrogen, nitrogen, and oxygen, were composed of diatomic molecules and not individual atoms.

Ihde [cite journal | author = Ihde, Aaron J. | title = The Karlsruhe Congress: A Centennial Retrospective | journal = Journal of Chemical Education | year = 1961 | volume = 38 | pages = 83 – 86 | url = http://search.jce.divched.org/JCEIndex/FMPro?-db=jceindex.fp5&-lay=wwwform&combo=karlsruhe&-find=&-format=detail.html&-skip=0&-max=1&-token.2=0&-token.3=10 (subscription required)] has argued that the Karlsruhe meeting was the first international meeting of chemists and that it led to the eventual founding of the International Union of Pure and Applied Chemistry.

Attendance

According to Wurtz's list [See [http://web.lemoyne.edu/~GIUNTA/karlsruhe.html Charles-Adolphe Wurtz's report on the Karlsruhe Congress] . Wurtz's list had "England" instead of "United Kingdom", and Warsaw was listed with Russia.] , the congress was attended by the scientists listed below.

# Belgium. "Brussels": Stas; "Ghent": Donny, A. Kekulé
# Germany. "Berlin": Ad. Baeyer, G. Quinke; "Bonn": H. Landolt; "Breslau": Lothar Meyer; "Kassel": Guckelberger,; Klausthal: Streng; "Darmstadt": E. Winkler; "Erlangen": v. Gorup-Besanez; "Freiburg i. B.": v. Babo, Schneyder; "Giessen": Boeckmann, H. Kopp, H. Will; "Göttingen": F. Beilstein; "Halle a. S.": W. Heintz; "Hanover": Heeren; "Heidelberg": Becker, O. Braun, R. Bunsen, L. Carius, E. Erlenmeyer, O. Mendius, Schiel; "Jena": Lehmann, H. Ludwig; "Karlsruhe": A. Klemm, R. Muller, J. Nessler, Petersen, K. Seubert, Weltzien; "Leipzig": O. L. Erdmann, Hirzel, Knop, Kuhn; "Mannheim": Gundelach, Schroeder; "Marburg a. L.": R. Schmidt, Zwenger; "Munich": Geiger; "Nuremberg": v. Bibra; "Offenbach": Grimm; "Rappenau": Finck; "Schönberg": R. Hoffmann; "Speyer": Keller, Mühlhaüser; "Stuttgart": v. Fehling, W. Hallwachs; "Tübingen": Finckh, A. Naumann, A. Strecker; "Wiesbaden": Kasselmann, R. Fresenius, C. Neubauer; "Würzburg": Scherer, v. Schwarzenbach
# United Kingdom. "Dublin": Apjohn A.; "Edinburgh": Al. Crum Brown, Wanklyn, F. Guthrie; "Glasgow": Anderson; "London": B. F. Duppa, G. C. Foster, Gladstone, Müller, Noad, A. Normandy, Odling; "Manchester": Roscoe; "Oxford": Daubeny, G. Griffeth, F. Schickendantz; "Woolwich": Abel
# France. "Montpellier": A. Béchamp, A. Gautier, C. G. Reichauer; "Mülhousen i. E.": Th. Schneider; "Nancy": J. Nicklès; "Paris": Boussingault, Dumas, C. Friedel, L. Grandeau, Le Canu, Persoz, Alf. Riche, P. Thénard, Verdét, C.-A. Wurtz; "Strasbourg i. E.": Jacquemin, Oppermann, F. Schlagdenhaussen, P. Schützenberger; "Tann": Ch. Kestner, Scheurer-Kestner
# Italy. "Genoa": Cannizzaro; "Pavia": Pavesi.
# Mexico. Posselt
# Austria. "Innsbruck": Hlasiwetz; "Lemberg": Pebal; "Pesth": Th. Wertheim; "Vienna": V. v. Lang , A. Lieben, Folwarezny, F. Schneider
# Portugal. "Coïmbra": Mide Carvalho
# Russia. "Kharkov": Sawitsch; "St. Petersburg": Borodin, Mendeleev, L. Schischkoff, Zinin N.;
# Poland. "Warsaw": T. Lesinski, J. Natanson
# Sweden. "Harpenden": J. H. Gilbert; "Lund": Berlin, C. W. Blomstrand; "Stockholm": Bahr
# Switzerland. "Bern": C. Brunner, H. Schiff; "Geneva": C. Marignac; "Lausanne": Bischoff; "Reichenau bei Chur": A. v. Planta; "Zurich": J. Wislicenus
# Spain. "Madrid": R. de Suna

References

Further reading

* (subscription required)

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*: (Note the incorrect spelling of Weltzien's name.)

*: (Originally published in 1964.)

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*: (Note the incorrect month given for the conference.)

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External links

* [http://web.lemoyne.edu/~GIUNTA/karlsruhe.html Charles-Adolphe Wurtz's report on the Karlsruhe Congress]

* [http://www.archive.org/details/sketchofcourseof00cannrich Cannizzaro's 1858 paper]

* [http://books.google.com/books?id=IPMHAAAAIAAJ&pg=PA1&dq=history+of+chemistry#PPR3,M1 "A History of Chemistry" by F. J. Moore (1918) New York: McGraw-Hill]