Joseph Louis Proust (September 26, 1754 – July 5, 1826)

• He was born on September 26, 1754 in Angers, France. He studied chemistry in his father’s shop and later came to Paris where he gained the appointment of apothecary in chief to the Salpetriere.

• He also taught chemistry with Pilâtre de Rozier, a famous astronaut.

• He became chief apothecary at the Saltpêtrière Hospital.

HIS CONTRIBUTIONS/WORKS

•  Proust’s largest accomplishment was disproving Berthollet (Thomsen-Berthelot principle is a hypothesis which states that all chemical changes are accompanied by the production of heat and that processes which occur will be ones in which the most heat is produce

• He  played a major role as chemical annalist, establishing the steadiness of the composition of chemical compounds. This contributed the prestige of Berthellot, who admitted that the composition of different substances depended on the concentration of reagents used in the reactions.

• He based his work on the study of copper carbonate reactions performed in the laboratory.

• He analytically studied the two tin oxides and the two iron sulfides, Proust studied copper carbonate.

 

LAW OF CONSTANT COMPOSITION

•  States that the composition of a substance is always the same, regardless of how the substance was made or where the substance is found.

MODELS

 Sources: 

http://en.wikipedia.org/wiki/Joseph_Proust
http://nautilus.fis.uc.pt/st2.5/scenes-e/biog/b0059.html
http://www.1911encyclopedia.org/Joseph_Louis_Proust
http://en.wikipedia.org/wiki/Thomsen-Berthelot_principle

http://www.answers.com/topic/joseph-proust

http://en.wikipedia.org/wiki/Joseph_Proust

http://cstl-csm.semo.edu/mcgowan/ch181/atomhist.htm
http://www.saskschools.ca/curr_content/science10/unitb/lawcomp.html
http://atomfreek.wordpress.com/2008/02/12/joseph-proust-1754-1826/