Francois marie raoult biography

The results obtained by Raoult were not very correct until the thermometer created by Beckmann was used in Two years later, using very dilute solutions, he found that while the constant for lowering the freezing point in water of organic compounds was While he held high regard for most of his career, Raoult's public image wavered when allegations of his sexual conquests arose.

In , two years before his death, a young girl found the feet of a dead man in Raoult's house. He denied having anything to do with the murder and was never charged but suspicions remained among the general populace. Imprimir Citar. Known for his participation in the origin of Raoult's laws on the colligative properties of chemical solutions: Tonometry law; ebullometry law; Cryometry law.

Achievements, contributions and contributions From his University of Grenoble, from which he would not leave until his death, he became famous for his works: In , he obtained the degree of Doctor in Physical Sciences from the University of Paris. In , the Royal Society of London awarded the Davy medal the highest distinction before the Nobel Prizes were created.

France decoded it with the Legion of Honor passing the rank of Officer in , to Commander in From to about Raoult turned his attention to studies on the effect of carbon dioxide on animal respiration, on the absorption of ammonia by ammonium nitrate, and on the rate of inversion of cane sugar under the influence of sunlight. Fourteen papers appeared during this stage, mainly in Comptes rendus.

The papers show excellent and careful work but were relatively trivial and far less interesting than the pioneering investigations of his earlier years. He had begun, however, to study the vapor pressure and freezing points of salt solutions, and the freezing point of alcohol solutions. This interest was to lead him to the physicochemieal third phase in which he made his most significant contributions to chemistry.

Richard Watson in and Charles Blagden in had shown that the freezing point of salt solutions is lowered in proportion to the weight of salt dissolved. In Raoult experimentally examined the lowering of the freezing point and of the vapor pressure of water caused by eighteen different salts. He found that the lowering of the vapor pressure caused by each of these salts was approximately proportional to the lowering of the freezing point.

In Raoult published a significant paper on his investigation of the lowering of the freezing point of a large number of aqueous solutions of organic compounds. In a series of papers appearing in Comptes rendus from to , Raoult described a method for finding the molecular weight of an organic compound by the determination of the lowering of the freezing point of water that resulted from dissolving that compound in water.

He first found by experimentation the simplest formula of the compound and the coefficient of lowering of the freezing point. Raoult soon turned to the anomalous results with salts in water, which had puzzled previous investigators. He classified the salts he used according to the valence of the radicals and found that the lowering of the freezing point could be accounted for by assigning certain numbers to these radicals.

He demonstrated that the freezing point lowering obtained with these salts was consistent with the hypothesis that the salt radicals themselves acted as if they existed independently in the solution, and that certain radicals were more effective than others in lowering the freezing point of water. In , using extremely dilute solutions, Raoult found that the molecular constant for organic compounds dissolved in water was During this time Raoult experimented with vapor pressure lowering in solutions.

He also showed that the lowering of the vapor pressure of water by a nonvolatile solute is proportional to the concentration of the solute. More From encyclopedia. Updated Aug 08 About encyclopedia. Francoeur, Louis-Joseph. Franco-Mendes, David. Franco-German War. Franco-Austrian War. Franco, Wellington Moreira —. Franco, Veronica — Franco, Rafael — Franco, Moses.

Franco, Larry. Franco, Johan Henri Gustav. Franco, James —. Franco, Itamar Augusto Cautiero —. Francois, Elma — Francois-Andre Philidor. Francome, John —. Read Edit View history. Tools Tools. Download as PDF Printable version. In other projects. Wikimedia Commons Wikidata item. French physical chemist — Fournes , France. Grenoble , France.