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In 1871 he discovered the synthesis of phenolphthalein by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions (hence the name). That same year he was the first to obtain synthetic fluorescein , a fluorophore pigment which is similar to naturally occurring pyoverdin that is synthesised by microorganisms (e.g ...
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols in experiments. It is a weak acid, which can lose H + ions in solution. The nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further proton loss in higher pH occurs slowly and leads to a colorless form.
Phenolphthalein can be synthesized by the condensation of phthalic anhydride with two equivalents of phenol under acidic conditions (hence the name). It was discovered in 1871 by Adolf von Baeyer. [8] [9] [10] Synthesis of phenolphthalein [11]
Joseph Priestley FRS (/ ˈ p r iː s t l i /; [3] 24 March 1733 – 6 February 1804) was an English chemist, Unitarian, natural philosopher, separatist theologian, grammarian, multi-subject educator and classical liberal political theorist. [4]
Michael Bell (born 1938), together with Melanie Chartoff (born 1950), U.S. – a gray water recycling device for reuse of shower and sink water in the home; Alexander Graham Bell (1847–1922), UK, Canada, and U.S. – telephone; Nikolay Benardos (1842–1905), Russian Empire – arc welding (specifically carbon arc welding, the first arc ...
Carl Wilhelm Scheele (German:, Swedish: [ˈɧêːlɛ]; 9 December 1742 – 21 May 1786 [2]) was a German Swedish [3] pharmaceutical chemist.. Scheele discovered oxygen (although Joseph Priestley published his findings first), and identified molybdenum, tungsten, barium, nitrogen, and chlorine, among others.
1810: Elemental nature of Chlorine discovered by Sir Humphry Davy (1778–1829). 1813: Elemental nature of Iodine discovered by Sir Humphry Davy (1778–1829). 1825: Benzene, the first known aromatic hydrocarbon, isolated and identified by Michael Faraday (1791–1867). [138] 1861: Thallium discovered by William Crookes (1832–1919). [54]
Joseph William Kennedy (May 30, 1916 – May 5, 1957) was an American chemist who co-discovered plutonium, along with Glenn T. Seaborg, Edwin McMillan, and Arthur Wahl. During World War II , he led the CM (Chemistry and Metallurgy) Division at the Manhattan Project 's Los Alamos Laboratory , where he oversaw research onto the chemistry and ...