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Courtois, Bernard

Bernard Courtois (1777-1838). When sulfuric add was added to the ashes obtained from seaweed, a violet gas was given off that condensed as dark crystals with a metallic luster. [Pg.61]

Iodine - the atomic number is 53 and the chemical symbol is I. The name derives from the Greek ioeides for violet colored because of its violet vapors. It was discovered in sea weed ash (kelp) by the French chemist Bernard Courtois in 1811. It was named iodine by the English chemist Humphry Davy in December 1813 and subsequently was named iode by the French chemist Louis-Joseph Gay-Lussac, when he proved it was an element in 1814. Dispite the priority rights dispute between Davy and Gay-Lussac, both acknowledged Courtois as the discoverer of the element. [Pg.12]

Similar to the history of many other elements, iodine s discovery was serendipitous in the sense that no one was looking for it specifically. In 1811 Bernard Courtois (1777—1838), a French chemist, attempted to remove sodium and potassium compounds from the ash of burned seaweed in order to make gunpowder. After removing these chemicals from the ash, he added sulfuric acid (H SO j) to the remaining ash. However, he mistakenly added too much acid, which produced a violet-colored vapor cloud that erupted from the mixture. This violet vapor condensed on all the metallic objects in the room, leaving a layer of sohd black iodine crystals. Sir Humphry Davy (1778—1829) confirmed this discovery of a new element and named it iodine after the Greek word iodes, which means violet, but it was Courtois who was given credit for the discovery of iodine. [Pg.255]

Iodine I 1811 (Paris, France) Bernard Courtois (French) 254... [Pg.397]

French chemist Bernard Courtois Highly reactive solid that vaporizes to a violet-colored gas found in seaweed used as an antiseptic, in salt compounds as a dietary supplement, and in the production of photographic film. [Pg.239]

Iodine was discovered in 1811 by French chemist, Bernard Courtois during the production of potassium nitrate for Napoleon s armies. It was recognized as a new element by Gay-Lussac who named it iodine. [Pg.397]

Toraude, L-G., Bernard Courtois et la decouverte de 1 iode, Vigot Freres,... [Pg.195]

From Toraude s Bernard Courtois et la Decouverte de Vlode ... [Pg.728]

Autograph of Bernard Courtois (1794). Translation I have received from D orgeu township SO casks of saltpeter solution which they have drawn from their property and which they have asked me to take because they have no one sufficiently trained to extract the saltpeter from it. Dijon the 11th of Messidor, tire 2nd year of the Republic, one and indivisible. B. Courtois, son.. . . He was seventeen years old when he wrote this receipt. [Pg.737]

Although J.-B. Courtois failed in business, he was an honest man, and both father and son struggled hard to pay their creditors. In 1808 Bernard Courtois married Madeleine Eulalie Morand, a young girl of humble parentage who could barely read and write. [Pg.738]

Birth of Bernard Courtois, the discoverer of iodine, at Dijon. [Pg.890]

Iodine.—During the Napoleonic wars, nitre beds were cultivated in various parts of France, and from these saltpetre was obtained artificially. About 1811, Bernard Courtois, a manufacturer of saltpetre, near Paris, used an aq. extract of varec or kelp for decomposing the calcium nitrate from the nitre beds he noticed that the copper vats in which the nitrate was decomposed were rapidly corroded by the liquid, and he traced the effects to a reaction between the copper and an unknown substance in the lye obtained by extracting the varec or kelp with water, B. Courtois isolated this new substance and ascertained its more obvious properties. In his paper entitled Dec uverte d une substance muvelle dans le vareck, and published about two years after his discovery,11 he said ... [Pg.23]

Iodine I 53 Bernard Courtois France Greek word "iodes" meaning "violet ... [Pg.96]

Iodine is the heaviest of the halogen family of elements, excluding the radioactive element astatine. It was discovered in 1811 by French chemist Bernard Courtois, who isolated the element from seaweed. The element is named for its color in the gas phase (the Greek word iodes means violet ). [Pg.248]

Iodine was discovered in 1811 by French chemist Bernard Courtois (1777—1838). The element occurs primarily in seawater and in solids formed when seawater evaporates. Its single most important property may be the ability to kill germs. It is used in antiseptics, germicides (products that kill germs), and other medical applications. However, it has a great many other important commercial applications. [Pg.267]

One of Bernard Courtois first jobs was to assist his father in making compounds of sodium and potassium from seaweed. Seaweed plants take sodium and potassium compounds out of seawater. The compounds become part of the growing seaweed. [Pg.267]

French chemist Bernard Courtois discovers iodine. [Pg.775]

In 1881, Bernard Courtois (1777-1838) introduced another halogen, iodine, extracting the element from wracks at the seashore. William Wallace proposed iodine tincture in 1835 to disinfect wounds. It was superseded by iodoform, which was less of an irritant, invented by Georges Simon Serullas (1774-1832). Structurally, it was very comparable to chloroform, the chlorine atom being substituted by an iodine one. Aqueous iodine solutions were proposed by Casimir Davaine (Lugol s solution) as antiseptics. [Pg.14]

Iodine was discovered by Bernard Courtois in 1811 and soon used in the treatment of water. It was the introduction of Lugol s iodine (or Lugol s solution) in 1829 that offered a more readily available form for immediate disinfection of drinking water. Iodine has been used as a disinfectant in military applications since World War I (White, 1999). In 1952, the current form of globafine tablets was first integrated into field use for water treatment by the U.S. Army and the tablets were widely distributed to those operating in austere environments (Powers, 1991). Iodine... [Pg.135]

In 1811, Bernard Courtois discovered natural iodine in water that was used to dissolve certain parts of seaweed ash for use. Radioactive iodine-131 was discovered by Glenn T. Seaborg and John Livingood at the University of California - Berkeley in the late 1930 s. [Pg.259]


See other pages where Courtois, Bernard is mentioned: [Pg.255]    [Pg.192]    [Pg.729]    [Pg.736]    [Pg.736]    [Pg.736]    [Pg.737]    [Pg.772]    [Pg.772]    [Pg.892]    [Pg.893]    [Pg.133]    [Pg.16]   
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