Heyrovsky, Jaroslav

Hess was immediately aware of the significance of his discovery and continued his studies in the same realm. In 1842 he proposed the law of thermoneutrality, which stated that no heat is evolved by the exchange reactions of neutral salts in aqueous solutions. He was not able to fully explain these observations, and it was not until forty-five years later that the process of electrolytic dissociation was more completely elucidated by the Swedish physicist and chemist Svante Arrhenius. 

Although his research activity diminished after these two major discoveries, Hess remained influential in the development of chemistry in Russia. His textbook Fundamentals of Pure Chemistry saw seven editions and remained the standard Russian text in chemistry until 1861. He remained active in teaching and mentoring younger scientists, until declining health forced his retirement in 1848. He died on December 13, 1850, at the relatively young age of forty-eight, see also Arrhenius, Svante Berzelius, Jons Jakob Thermochemistry. 

Leicester, Henry M. (1951). Germain Henri Hess and the Foundation of Thermochemistry. Journal of Chemical Education 28 581-583. 

Jaroslav Heyrovsky was born on November 20, 1890, in Prague (then part of the Austro-Hungarian Empire), where he also died on March 27, 1967. He began studying chemistry and physics at Prague University in 1909. 

Kohlrausch drum rotating cylinder used to mount a variable resistance slide wire for a polarograph 

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Heyrovsky, Jaroslav (1890-1967) received the 1959 Nobel Prize in Chemistry for his discovery of polarography and for his role in the development of this technique which has become such an important tool in electrochemistry, analytical chemistry and many other areas of science and technology. He was for many years a professor of physical chemistry at the Charles University of Prague. When the Prague Polarographic Institute was founded in 1950, Heyrowski became its first director. Obituary notices for Prof Heyrowski appeared in many scientific journals attesting to his widespread recognition and esteem Refs 1) Anon, C EN 45,16 83 (1967) ... 

Heyrovsky, Jaroslav (1941). Polarographie. Vienna Springer Verlag. 

Heyrovsky, Jaroslav, and Kuta, Jaroslav (1965). Principles of Polarography. Prague Publishing House of the Czechoslovak Academy of Sciences. 

Heyrovsky, Jaroslav, portrait. The Library of Congress p. 208 Hodgkin, Dorothy, photograph. Archive Photos, Inc./Express Newspapers. Reproduced by permission p. 216 Chlorine plant in Louisiana, photograph. 

Heyrovsky, Jaroslav. (1890-1967). A Czechoslovakian physiochemist who won the Nobel Prize for chemistry in 1959. He is known for work in electrochemistry. He developed polarographic and oscillo-polarographic methods. Although his Ph.D. was from the University of Prague, he later studied in London. 

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